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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Epidemiology of respiratory viruses in Saudi Arabia: toward a complete picture</title>
<author><name sortKey="Farrag, Mohamed A" sort="Farrag, Mohamed A" uniqKey="Farrag M" first="Mohamed A." last="Farrag">Mohamed A. Farrag</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Hamed, Maaweya E" sort="Hamed, Maaweya E" uniqKey="Hamed M" first="Maaweya E." last="Hamed">Maaweya E. Hamed</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Amer, Haitham M" sort="Amer, Haitham M" uniqKey="Amer H" first="Haitham M." last="Amer">Haitham M. Amer</name>
<affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0639 9286</institution-id>
<institution-id institution-id-type="GRID">grid.7776.1</institution-id>
<institution>Department of Virology, Faculty of Veterinary Medicine,</institution>
<institution>Cairo University,</institution>
</institution-wrap>
Giza, Egypt</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Almajhdi, Fahad N" sort="Almajhdi, Fahad N" uniqKey="Almajhdi F" first="Fahad N." last="Almajhdi">Fahad N. Almajhdi</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">31139937</idno>
<idno type="pmc">7087236</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7087236</idno>
<idno type="RBID">PMC:7087236</idno>
<idno type="doi">10.1007/s00705-019-04300-2</idno>
<date when="2019">2019</date>
<idno type="wicri:Area/Pmc/Corpus">000222</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000222</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Epidemiology of respiratory viruses in Saudi Arabia: toward a complete picture</title>
<author><name sortKey="Farrag, Mohamed A" sort="Farrag, Mohamed A" uniqKey="Farrag M" first="Mohamed A." last="Farrag">Mohamed A. Farrag</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Hamed, Maaweya E" sort="Hamed, Maaweya E" uniqKey="Hamed M" first="Maaweya E." last="Hamed">Maaweya E. Hamed</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Amer, Haitham M" sort="Amer, Haitham M" uniqKey="Amer H" first="Haitham M." last="Amer">Haitham M. Amer</name>
<affiliation><nlm:aff id="Aff2"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0639 9286</institution-id>
<institution-id institution-id-type="GRID">grid.7776.1</institution-id>
<institution>Department of Virology, Faculty of Veterinary Medicine,</institution>
<institution>Cairo University,</institution>
</institution-wrap>
Giza, Egypt</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Almajhdi, Fahad N" sort="Almajhdi, Fahad N" uniqKey="Almajhdi F" first="Fahad N." last="Almajhdi">Fahad N. Almajhdi</name>
<affiliation><nlm:aff id="Aff1"><institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">Archives of Virology</title>
<idno type="ISSN">0304-8608</idno>
<idno type="eISSN">1432-8798</idno>
<imprint><date when="2019">2019</date>
</imprint>
</series>
</biblStruct>
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<front><div type="abstract" xml:lang="en"><p id="Par1">Acute lower respiratory tract infection is a major health problem that affects more than 15% of the total population of Saudi Arabia each year. Epidemiological studies conducted over the last three decades have indicated that viruses are responsible for the majority of these infections. The epidemiology of respiratory viruses in Saudi Arabia is proposed to be affected mainly by the presence and mobility of large numbers of foreign workers and the gathering of millions of Muslims in Mecca during the Hajj and Umrah seasons. Knowledge concerning the epidemiology, circulation pattern, and evolutionary kinetics of respiratory viruses in Saudi Arabia are scant, with the available literature being inconsistent. This review summarizes the available data on the epidemiology and evolution of respiratory viruses. The demographic features associated with Middle East respiratory syndrome-related coronavirus infections are specifically analyzed for a better understanding of the epidemiology of this virus. The data support the view that continuous entry and exit of pilgrims and foreign workers with different ethnicities and socioeconomic backgrounds in Saudi Arabia is the most likely vehicle for global dissemination of respiratory viruses and for the emergence of new viruses (or virus variants) capable of greater dissemination.</p>
</div>
</front>
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<pmc article-type="review-article"><pmc-dir>properties open_access</pmc-dir>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Arch Virol</journal-id>
<journal-id journal-id-type="iso-abbrev">Arch. Virol</journal-id>
<journal-title-group><journal-title>Archives of Virology</journal-title>
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<issn pub-type="ppub">0304-8608</issn>
<issn pub-type="epub">1432-8798</issn>
<publisher><publisher-name>Springer Vienna</publisher-name>
<publisher-loc>Vienna</publisher-loc>
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</journal-meta>
<article-meta><article-id pub-id-type="pmid">31139937</article-id>
<article-id pub-id-type="pmc">7087236</article-id>
<article-id pub-id-type="publisher-id">4300</article-id>
<article-id pub-id-type="doi">10.1007/s00705-019-04300-2</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Review</subject>
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<title-group><article-title>Epidemiology of respiratory viruses in Saudi Arabia: toward a complete picture</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Farrag</surname>
<given-names>Mohamed A.</given-names>
</name>
<address><email>mfarrag@ksu.edu.sa</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Hamed</surname>
<given-names>Maaweya E.</given-names>
</name>
<address><email>mhamed1@ksu.edu.sa</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Amer</surname>
<given-names>Haitham M.</given-names>
</name>
<address><email>hamoamer@yahoo.com</email>
</address>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Almajhdi</surname>
<given-names>Fahad N.</given-names>
</name>
<address><email>majhdi@ksu.edu.sa</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<aff id="Aff1"><label>1</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 1773 5396</institution-id>
<institution-id institution-id-type="GRID">grid.56302.32</institution-id>
<institution>Department of Botany and Microbiology, College of Science,</institution>
<institution>King Saud University,</institution>
</institution-wrap>
P.O. Box 2455QA6, Riyadh, 11451 Saudi Arabia</aff>
<aff id="Aff2"><label>2</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0004 0639 9286</institution-id>
<institution-id institution-id-type="GRID">grid.7776.1</institution-id>
<institution>Department of Virology, Faculty of Veterinary Medicine,</institution>
<institution>Cairo University,</institution>
</institution-wrap>
Giza, Egypt</aff>
</contrib-group>
<author-notes><fn fn-type="com"><p>Handling Editor: Carolina Scagnolari.</p>
</fn>
</author-notes>
<pub-date pub-type="epub"><day>28</day>
<month>5</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="ppub"><year>2019</year>
</pub-date>
<volume>164</volume>
<issue>8</issue>
<fpage>1981</fpage>
<lpage>1996</lpage>
<history><date date-type="received"><day>12</day>
<month>12</month>
<year>2018</year>
</date>
<date date-type="accepted"><day>1</day>
<month>5</month>
<year>2019</year>
</date>
</history>
<permissions><copyright-statement>© Springer-Verlag GmbH Austria, part of Springer Nature 2019</copyright-statement>
<license><license-p>This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.</license-p>
</license>
</permissions>
<abstract id="Abs1"><p id="Par1">Acute lower respiratory tract infection is a major health problem that affects more than 15% of the total population of Saudi Arabia each year. Epidemiological studies conducted over the last three decades have indicated that viruses are responsible for the majority of these infections. The epidemiology of respiratory viruses in Saudi Arabia is proposed to be affected mainly by the presence and mobility of large numbers of foreign workers and the gathering of millions of Muslims in Mecca during the Hajj and Umrah seasons. Knowledge concerning the epidemiology, circulation pattern, and evolutionary kinetics of respiratory viruses in Saudi Arabia are scant, with the available literature being inconsistent. This review summarizes the available data on the epidemiology and evolution of respiratory viruses. The demographic features associated with Middle East respiratory syndrome-related coronavirus infections are specifically analyzed for a better understanding of the epidemiology of this virus. The data support the view that continuous entry and exit of pilgrims and foreign workers with different ethnicities and socioeconomic backgrounds in Saudi Arabia is the most likely vehicle for global dissemination of respiratory viruses and for the emergence of new viruses (or virus variants) capable of greater dissemination.</p>
</abstract>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© Springer-Verlag GmbH Austria, part of Springer Nature 2019</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
<body><sec id="Sec1"><title>Introduction</title>
<p id="Par2">Respiratory tract infections (RTIs) are detrimental to the health of individuals and economies. Millions of deaths due to acute lower RTIs (ARTIs) occur each year worldwide. The deaths commonly occur in premature infants, immunocompromised patients, individuals with bronchopulmonary dysplasia, and the elderly as a result of severe pneumonia. Children under 5 years of age are also vulnerable, with annual estimates of 1.9 [<xref ref-type="bibr" rid="CR1">1</xref>
], 10.8 [<xref ref-type="bibr" rid="CR2">2</xref>
] and [<xref ref-type="bibr" rid="CR3">3</xref>
] million deaths. Viruses are a major cause of ARTIs [<xref ref-type="bibr" rid="CR4">4</xref>
]. Human respiratory syncytial virus (HRSV) is the most frequent pathogen, followed by influenza viruses, human rhinovirus, enterovirus, human coronavirus, human parainfluenza viruses, and human metapneumoviruses [<xref ref-type="bibr" rid="CR5">5</xref>
]. In addition to these, newly emerging viruses, including severe acute respiratory syndrome-related coronavirus (SARS-CoV), Middle East respiratory syndrome-related coronavirus (MERS-CoV), and influenza viruses of swine (H1N1) and avian (H5N1, H7N9) origin are a threat to public health.</p>
<p id="Par3">In Saudi Arabia, ARTI cases involved over 5 million (15.4%) of the population in 2013 [<xref ref-type="bibr" rid="CR6">6</xref>
]. The epidemiology, evolution, and circulation patterns of respiratory viruses in Saudi Arabia may be affected by two major factors. One is the presence of over 11.9 million foreign workers from more than 100 countries [<xref ref-type="bibr" rid="CR7">7</xref>
]. The movements of this huge number back and forth between their home nations and the Kingdom of Saudi Arabia may help to introduce new viral strains. The second factor is the gathering of more than 10 million Muslims from approximately 184 different countries in the holy sites of Mecca and Medina during the Hajj and Umrah seasons. Pilgrims and foreign workers are a large heterogeneous population in terms of ethnicity, underlying medical conditions, including a markedly variable rate of lower RTIs [<xref ref-type="bibr" rid="CR8">8</xref>
], and socioeconomic backgrounds. During the 3- to 4-day Hajj ritual, many pilgrims are confined in close proximity in tents and alleys [<xref ref-type="bibr" rid="CR9">9</xref>
, <xref ref-type="bibr" rid="CR10">10</xref>
]. The overcrowding is ideal for the spread of respiratory viruses and is a major public health concern. Those who become infected can pass the respiratory viral infection on to others upon their return to their countries [<xref ref-type="bibr" rid="CR11">11</xref>
–<xref ref-type="bibr" rid="CR14">14</xref>
].</p>
<p id="Par4">The circulation patterns of respiratory viruses in Saudi Arabia are unclear. This lack of clarity is due to the paucity of studies being done, the past focus on respiratory viruses present during the Hajj season, and the relative lack of information concerning the evolution and phylogeny of respiratory viruses, compared to virus detection. We have studied the prevalence, epidemiology, and phylogeny of several respiratory viruses, including influenza viruses [<xref ref-type="bibr" rid="CR15">15</xref>
, <xref ref-type="bibr" rid="CR16">16</xref>
], parainfluenza viruses [<xref ref-type="bibr" rid="CR17">17</xref>
–<xref ref-type="bibr" rid="CR19">19</xref>
], HRSV [<xref ref-type="bibr" rid="CR20">20</xref>
, <xref ref-type="bibr" rid="CR21">21</xref>
], human metapneumovirus [<xref ref-type="bibr" rid="CR22">22</xref>
], and others [<xref ref-type="bibr" rid="CR23">23</xref>
]. These data are discussed in the subsequent sections. Importantly, these data are mainly for respiratory viruses circulating in Riyadh.</p>
<p id="Par5">The intent of the current review is to collect and present a full historical record of respiratory virus infections in the population of Saudi Arabia in terms of epidemiology, circulation pattern, genetic and phylogenetic analysis, and evolutionary perspectives. Moreover, epidemiologic and demographic features associated with MERS-CoV infections are addressed by analyzing the clinical data of 1549 laboratory-confirmed cases of MERS-CoV infections and by considering the camel-to-human and human-to-human transmission of MERS-CoV.</p>
</sec>
<sec id="Sec2"><title>MERS-CoV</title>
<sec id="Sec3"><title>The virus</title>
<p id="Par6">Viruses within the subfamily <italic>Orthocoronavirinae</italic>
(family <italic>Coronaviridae</italic>
, order <italic>Nidovirales</italic>
) are grouped into four genera: <italic>Alpha</italic>
-, <italic>Beta</italic>
-, <italic>Gamma</italic>
-, and <italic>Deltacoronavirus</italic>
[<xref ref-type="bibr" rid="CR24">24</xref>
]. Six coronaviruses can infect humans: HCoV-229E, NL63, OC43, HKU1, SARS-CoV, and MERS-CoV. The first two belong to the genus <italic>Alphacoronavirus</italic>
, and the remainder belong to the genus <italic>Betacoronavirus</italic>
, with MERS-CoV belonging to lineage C [<xref ref-type="bibr" rid="CR25">25</xref>
]. CoVs are characterized by having the largest genome of RNA viruses (29–32 kb). The genome is single-stranded, positive-sense, and enclosed within particles with a corona-like morphology [<xref ref-type="bibr" rid="CR26">26</xref>
].</p>
</sec>
<sec id="Sec4"><title>Epidemiology</title>
<p id="Par7">The capability of CoVs to infect a wide range of hosts, including animals and humans, has been known for a long time. CoVs often cause mild and self-limited respiratory diseases in humans [<xref ref-type="bibr" rid="CR27">27</xref>
, <xref ref-type="bibr" rid="CR28">28</xref>
]. However, CoVs received much attention after the SARS-CoV pandemic that began in mid-November of 2002 in Guangdong, China. The virus spread to several countries around the world and led to the death of 774 (9.56%) of 8,096 infected individuals reported to the World Health Organization (WHO) [<xref ref-type="bibr" rid="CR29">29</xref>
]. A SARS-like CoV identified as MERS-CoV was isolated from a Saudi patient in 2012. MERS-CoV quickly spread to neighboring countries, followed by a wider spread to geographically distant countries [<xref ref-type="bibr" rid="CR25">25</xref>
, <xref ref-type="bibr" rid="CR30">30</xref>
, <xref ref-type="bibr" rid="CR31">31</xref>
]. WHO statistics from January 2019 indicate that this outbreak involved 27 countries with 2,279 laboratory-confirmed cases and 806 deaths (35.3% case fatality rate). Saudi Arabia was the hotspot of the outbreak, with 1901 cases reported and 732 deaths (38.7% case fatality rate) [<xref ref-type="bibr" rid="CR32">32</xref>
].</p>
<p id="Par8">In the spring of 2014, another outbreak occurred in Saudi Arabia. Up to 500 laboratory-confirmed cases were identified within a short period of time. The outbreak originated in Jeddah, with cases also detected at the same time in Riyadh, Al-Kharj, and Medina [<xref ref-type="bibr" rid="CR33">33</xref>
]. An attempt to study the epidemiology of MERS-CoV was made based on data collected from the Saudi Ministry of Health during 2012 to July 2015. The risk factors and case fatality rates among 939 MERS-CoV-infected individuals were analyzed [<xref ref-type="bibr" rid="CR34">34</xref>
]. To increase our understanding of MERS-CoV epidemiology, we analyzed the demographic data of 1549 MERS-CoV-confirmed cases. Data from May 2013 to March 2018 were retrieved from the Ministry of Health and statistically evaluated. The largest numbers of MERS-CoV cases were reported in 2014 (n = 523) and 2015 (n = 452) (Table <xref rid="Tab1" ref-type="table">1</xref>
). More recently, the number of hospital-acquired cases has dropped significantly due to improved control measures.<table-wrap id="Tab1"><label>Table 1</label>
<caption><p>Demographic characteristics of MERS-CoV-infected individuals in Saudi Arabia from May 2013 to March 2018</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left" rowspan="2">Year</th>
<th align="left" rowspan="2">Total</th>
<th align="left" colspan="2">Sex</th>
<th align="left" colspan="2">Nationality</th>
<th align="left" rowspan="2">Co-morbidities</th>
<th align="left" colspan="4">Age</th>
<th align="left" colspan="2">Infection Acquisition</th>
<th align="left" rowspan="2"><sup>a</sup>
HCP</th>
</tr>
<tr><th align="left">Male</th>
<th align="left">Female</th>
<th align="left">Saudi</th>
<th align="left">Non-Saudi</th>
<th align="left"><20</th>
<th align="left">20-40</th>
<th align="left">41-60</th>
<th align="left">>60</th>
<th align="left">Human</th>
<th align="left">Animal</th>
</tr>
</thead>
<tbody><tr><td align="left"><bold>2013</bold>
</td>
<td align="left">98</td>
<td align="left">56 (57%)</td>
<td char="(" align="char">29 (29.5%)</td>
<td align="left">61 (62%)</td>
<td char="(" align="char">16 (57%)</td>
<td align="left">42 (42.8%)</td>
<td align="left">3 (3%)</td>
<td char="(" align="char">16 (57%)</td>
<td char="(" align="char">30 (16%)</td>
<td char="(" align="char">28 (28%)</td>
<td align="left">22 (22%)</td>
<td char="(" align="char">1 (1%)</td>
<td align="left">12 (12%)</td>
</tr>
<tr><td align="left"><bold>2014</bold>
</td>
<td align="left">523</td>
<td align="left">324 (62%)</td>
<td char="(" align="char">185 (35%)</td>
<td align="left">418 (80%)</td>
<td char="(" align="char">102 (19%)</td>
<td align="left">216(41%)</td>
<td align="left">21 (4%)</td>
<td char="(" align="char">169 (32%)</td>
<td char="(" align="char">187 (35%)</td>
<td char="(" align="char">145 (27%)</td>
<td align="left">146 (28%)</td>
<td char="(" align="char">16 (3%)</td>
<td align="left">38 (7%)</td>
</tr>
<tr><td align="left"><bold>2015</bold>
</td>
<td align="left">452</td>
<td align="left">300 (66%)</td>
<td char="(" align="char">150 (33%)</td>
<td align="left">334 (74%)</td>
<td char="(" align="char">117 (26%)</td>
<td align="left">244 (54%)</td>
<td align="left">2 (0.4%)</td>
<td char="(" align="char">119 (26%)</td>
<td char="(" align="char">155 (34%)</td>
<td char="(" align="char">175 (39%)</td>
<td align="left">175 (39%)</td>
<td char="(" align="char">21 (4%)</td>
<td align="left">39 (8%)</td>
</tr>
<tr><td align="left"><bold>2016</bold>
</td>
<td align="left">218</td>
<td align="left">162 (74%)</td>
<td char="(" align="char">59 (13%)</td>
<td align="left">159 (73%)</td>
<td char="(" align="char">62 (28%)</td>
<td align="left">75 (34%)</td>
<td align="left">0</td>
<td char="(" align="char">55 (25%)</td>
<td char="(" align="char">87 (40%)</td>
<td char="(" align="char">74 (34%)</td>
<td align="left">65(30%)</td>
<td char="(" align="char">135 (62%)</td>
<td align="left">31 (14%)</td>
</tr>
<tr><td align="left"><bold>2017</bold>
</td>
<td align="left">219</td>
<td align="left">145 (66%)</td>
<td char="(" align="char">74 (34%)</td>
<td align="left">140 (64%)</td>
<td char="(" align="char">79 (36%)</td>
<td align="left">65 (30%)</td>
<td align="left">9 (4%)</td>
<td char="(" align="char">59 (27%)</td>
<td char="(" align="char">86 (39%)</td>
<td char="(" align="char">73 (33%)</td>
<td align="left">83 (38%)</td>
<td char="(" align="char">121 (55%)</td>
<td align="left">37 (17%)</td>
</tr>
<tr><td align="left"><bold>2018</bold>
</td>
<td align="left">39</td>
<td align="left">31 (79%)</td>
<td char="(" align="char">8 (20%)</td>
<td align="left">32 (82%)</td>
<td char="(" align="char">7 (18%)</td>
<td align="left">3 (7.6%)</td>
<td align="left">0</td>
<td char="(" align="char">8 (25%)</td>
<td char="(" align="char">15 (38%)</td>
<td char="(" align="char">16 (41%)</td>
<td align="left">7 (18%)</td>
<td char="(" align="char">30 (77%)</td>
<td align="left">1 (2.5%)</td>
</tr>
<tr><td align="left"><bold>Total</bold>
</td>
<td align="left">1549</td>
<td align="left">987 (64%)</td>
<td char="(" align="char">497 (32%)</td>
<td align="left">1112 (72%)</td>
<td char="(" align="char">376 (24%)</td>
<td align="left">642 (41%)</td>
<td align="left">35 (2%)</td>
<td char="(" align="char">418 (27%)</td>
<td char="(" align="char">545 (35%)</td>
<td char="(" align="char">495 (32%)</td>
<td align="left">491 (32%)</td>
<td char="(" align="char">294 (19%)</td>
<td align="left">157 (10%)</td>
</tr>
<tr><td align="left"><sup><bold><italic>b</italic>
</bold>
</sup>
<bold>P value</bold>
</td>
<td align="left">< 0.001</td>
<td align="left" colspan="2">< 0.001</td>
<td align="left" colspan="2">< 0.001</td>
<td align="left">< 0.001</td>
<td align="left" colspan="4">< 0.001</td>
<td align="left" colspan="2">< 0.001</td>
<td align="left">< 0.001</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p>Data from laboratory-confirmed MERS-CoV cases were retrieved from the official Ministry of Health website (<ext-link ext-link-type="uri" xlink:href="http://www.moh.gov.sa/en/CCC/PressReleases/Pages/default.aspx">http://www.moh.gov.sa/en/CCC/PressReleases/Pages/default.aspx</ext-link>
)</p>
<p><sup>a</sup>
HCP: health care practitioners</p>
<p><sup>b</sup>
<italic>p</italic>
-values are the results of the chi-square test against the null hypothesis (i.e., no difference in proportions across groups), excluding patients with no demographic data and those with an unknown source of acquisition</p>
</table-wrap-foot>
</table-wrap>
</p>
<p id="Par9">Among the regions of the kingdom (Fig. <xref rid="Fig1" ref-type="fig">1</xref>
), the Central Region (Riaydh, Qasim) was the most affected area, followed by the Western Region (Mecca, Medina, Jeddah), Eastern Region (Damam, Khafji, Alhasa), Northern Region (Tabuk, Jouf, Hail), and Southern Region (Asir, Najran, Jizan) (Fig. <xref rid="Fig2" ref-type="fig">2</xref>
). Except for August and September 2015, significant MERS-CoV peaks were observed between March and May of the remaining years (Fig. <xref rid="Fig3" ref-type="fig">3</xref>
). Analysis of demographic data of patients revealed that 35% (n = 545) of those infected were 41 to 60 years of age, 32% (n = 495) were more than 60 years of age, 27% (n = 418) were 20 to 40 years of age, and 2% (n = 35) were younger than 20 years of age. Males (64%) were more frequently infected than females (32%). However, in a previous study, both sexes displayed the same mortality rate [<xref ref-type="bibr" rid="CR35">35</xref>
]. Co-morbidities, including diabetes, renal diseases, hypertension, and pulmonary diseases, were evident in 642 (41%) of the MERS-CoV cases (Table <xref rid="Tab1" ref-type="table">1</xref>
). A cross-sectional serologic survey of human serum samples collected from healthy individuals (>15 years of age) across all 13 provinces of Saudi Arabia was performed. MERS-CoV antibodies were detected only in 15 (0.15%) of 10,009 samples collected from blood donors and slaughterhouse workers. Up to 45,000 Saudis may be seropositive for MERS-CoV but asymptomatic [<xref ref-type="bibr" rid="CR36">36</xref>
]. Such individuals are potential sources for the spread of MERS-CoV.<fig id="Fig1"><label>Fig. 1</label>
<caption><p>Map of Saudi Arabia showing different regions. A) The Central Region (Riaydh, Qasim), B) Eastern Region (Damam, Khafji, Alhasa), C) Western Region (Mecca, Medina, Jeddah), D) Southern Region (Asir, Najran, Jizan), and E) Northern Region (Tabuk, Jouf, Hail). The asterisk symbol denotes the site where the first case of MERS-CoV was reported. The locations of the two holy mosques are indicated on the map at Mecca and Medina</p>
</caption>
<graphic xlink:href="705_2019_4300_Fig1_HTML" id="MO1"></graphic>
</fig>
<fig id="Fig2"><label>Fig. 2</label>
<caption><p>Incidence of MERS-CoV infection in Saudi Arabia from May 2013 to March 2018. The Central Region (Riaydh, Qasim) followed by the Western Region (Mecca, Medina, Jeddah) are the most strongly affected areas. The Southern (Asir, Najran, Jizan) and Northern (Tabuk, Jouf, Hail) regions had fewer reported cases. The largest number of MERS-CoV cases was reported during 2014 and 2015</p>
</caption>
<graphic xlink:href="705_2019_4300_Fig2_HTML" id="MO2"></graphic>
</fig>
<fig id="Fig3"><label>Fig. 3</label>
<caption><p>Monthly records of MERS-CoV infection in Saudi Arabia from May 2013 to March 2018. Except for August and September 2015, significant MERS-CoV peaks were observed between March and May of the remaining years</p>
</caption>
<graphic xlink:href="705_2019_4300_Fig3_HTML" id="MO3"></graphic>
</fig>
</p>
</sec>
<sec id="Sec5"><title>Camel-to-human and human-to-human transmission of MERS-CoV</title>
<p id="Par10">MERS-CoV has a wide species tropism, as the virus can replicate in a variety of mammalian cells of different origins [<xref ref-type="bibr" rid="CR37">37</xref>
]. This suggests that the virus originated from animals. As is the case with several beta-CoVs, bats are the common reservoir from which the virus jumped to humans through intermediate hosts [<xref ref-type="bibr" rid="CR38">38</xref>
]. MERS-CoV is thought to be transmitted to humans directly from bats or through an intermediate host, most likely dromedary camels [<xref ref-type="bibr" rid="CR39">39</xref>
–<xref ref-type="bibr" rid="CR41">41</xref>
]. Many studies have sought to define the animal reservoir, intermediate host(s), and the possibility of human-to-human transmission. Although bats are considered the ancestral reservoir of CoVs [<xref ref-type="bibr" rid="CR42">42</xref>
], camels are important for the maintenance and diversification of MERS CoVs, and they are the source of human infections. It has been estimated that camel exposure resulted in 12% of MERS-CoV infections [<xref ref-type="bibr" rid="CR43">43</xref>
]. A survey of MERS-CoV-infected individuals from 20 hospitals in Saudi Arabia revealed that some had direct contact with camels, while others had likely acquired the virus from infected humans [<xref ref-type="bibr" rid="CR44">44</xref>
]. The possibility of human-to-human transmission was also supported by the presence of hospital-associated outbreaks in several countries, including Saudi Arabia [<xref ref-type="bibr" rid="CR30">30</xref>
, <xref ref-type="bibr" rid="CR33">33</xref>
, <xref ref-type="bibr" rid="CR45">45</xref>
–<xref ref-type="bibr" rid="CR48">48</xref>
].</p>
<p id="Par11">The transmission from camels to humans in several studies has indicated that camels are the most likely intermediate host for MERS-CoV. In one case in Saudi Arabia, a patient in contact with his infected camels was admitted to the intensive care unit of a hospital in Jeddah with respiratory dyspnea. The patient died 15 days after admission. The MERS-CoV isolates obtained from the patient and one of the camels were genetically identical [<xref ref-type="bibr" rid="CR49">49</xref>
]. Sequence similarity between MERS-CoV isolated from camels and humans has also been reported in other studies [<xref ref-type="bibr" rid="CR50">50</xref>
–<xref ref-type="bibr" rid="CR52">52</xref>
]. In a similar case, a 62-year-old man living in the Al-Hasa region was the source of an outbreak after likely acquiring the infection from a camel. He spread the infection to his family and three public hospitals, resulting in 52 cases and 18 deaths [<xref ref-type="bibr" rid="CR53">53</xref>
]. In other studies, MERS-CoV was detected in serum samples collected from camels throughout Saudi Arabia, while specific antibodies were not detected in domestic sheep, goats, cows, or equids [<xref ref-type="bibr" rid="CR39">39</xref>
, <xref ref-type="bibr" rid="CR54">54</xref>
, <xref ref-type="bibr" rid="CR55">55</xref>
]. Viral RNA was also detected in camels’ milk [<xref ref-type="bibr" rid="CR56">56</xref>
]. In another study, virus replication, shedding, and persistence were evaluated by infecting dromedary camels intranasally, intratracheally, and conjunctively. Infected camels shed high titers of virus for 7 days post-inoculation, and viral RNA was detected on day 35 post-inoculation [<xref ref-type="bibr" rid="CR57">57</xref>
]. Coinfection with MERS-CoV and other coronaviruses (i.e., non-MERS viruses) has been documented. Two non-MERS-related CoVs were isolated with sequence similarity to human coronaviruses 229E and OC43 [<xref ref-type="bibr" rid="CR58">58</xref>
].</p>
<p id="Par12">From the above findings, it is clear that camels play a key role in maintenance, divergence, and transmission of MERS CoVs. However, two points require further investigation. Firstly, MERS-CoV-specific antibodies were detected in archival samples collected from dromedary camels in Saudi Arabia during 1992 to 2010. Similarly, a high percentage of archived samples collected since 1983 from camels in eastern Africa were found to contain MERS-CoV-neutralizing antibodies (153/189) [<xref ref-type="bibr" rid="CR59">59</xref>
]. These findings indicate the high prevalence of MERS-CoV in camels, but it is not clear why camel-to-human transmission occurred only during 2012 and not before. Secondly, MERS-CoV antibodies were detected in camels from Egypt, Jordan, Egypt, Nigeria, Ethiopia, Kenya, Burkina Faso, Morocco, Tunisia, and Spain [<xref ref-type="bibr" rid="CR50">50</xref>
, <xref ref-type="bibr" rid="CR51">51</xref>
, <xref ref-type="bibr" rid="CR60">60</xref>
–<xref ref-type="bibr" rid="CR62">62</xref>
], but camel-to-human transmission has been reported only in Saudi Arabia.</p>
</sec>
</sec>
<sec id="Sec6"><title>Influenza viruses</title>
<sec id="Sec7"><title>The virus</title>
<p id="Par13">Influenza viruses are members of the family <italic>Orthomyxoviridae</italic>
. This family includes viruses with a single-stranded, negative-sense, segmented RNA genome [<xref ref-type="bibr" rid="CR63">63</xref>
]. Based on variations in the nucleoprotein and matrix proteins, orthomyxoviruses are classified into seven different genera: <italic>Alphainfluenzavirus</italic>
(influenza A virus), <italic>Betainfluenzavirus</italic>
(influenza B virus), <italic>Deltainfluenzavirus</italic>
(influenza D virus), <italic>Gammainfluenzavirus</italic>
(influenza C virus), <italic>Thogotovirus</italic>
, <italic>Quaranjavirus</italic>
, and <italic>Isavirus</italic>
[<xref ref-type="bibr" rid="CR64">64</xref>
]. Among the orthomyxoviruses, influenza A viruses, the most important causative agents of flu pandemics, are classified into several antigenic subtypes based on their hemagglutinin (H,18 subtypes) and neuraminidase (N, 11 subtypes) surface proteins [<xref ref-type="bibr" rid="CR65">65</xref>
].</p>
</sec>
<sec id="Sec8"><title>Epidemiology</title>
<p id="Par14">Influenza viruses are highly contagious pathogens. They infect a wide range of hosts, such as birds, humans, pigs, horses [<xref ref-type="bibr" rid="CR66">66</xref>
], cats, and whales [<xref ref-type="bibr" rid="CR67">67</xref>
]. Worldwide, influenza A viruses have caused serious and massive pandemics where millions of cases have been reported with high mortality rates. Moreover, these viruses strongly affect the economies of developing and developed countries. In the United States, the annually estimated cost of treatment exceeds $10 billion [<xref ref-type="bibr" rid="CR68">68</xref>
]. Several influenza A virus subtypes have caused serious human pandemics. Influenza A H2N2 virus was responsible for the Asian/Russian pandemic that killed approximately one million humans in 1889. The virus re-emerged in 1957 and killed approximately 2 million people. Influenza A H1N1 virus, the causative agent of Spanish flu, caused approximately 500 million infections and approximately 50 million deaths in 1918. An H1N1 outbreak dubbed “swine flu” began in 2009 and continues to cause epidemics with high morbidity and mortality rates [<xref ref-type="bibr" rid="CR69">69</xref>
]. The ability of influenza A virus to evolve and to cross species barriers has resulted in the emergence of new subtypes, including H7N9 [<xref ref-type="bibr" rid="CR70">70</xref>
], H10N8 [<xref ref-type="bibr" rid="CR71">71</xref>
], H17N10, and H18N11[<xref ref-type="bibr" rid="CR65">65</xref>
].</p>
<p id="Par15">The Saudi Ministry of Health established a surveillance program for influenza viruses [<xref ref-type="bibr" rid="CR72">72</xref>
]. Several issues concerning epidemiology, antigenicity, and genetic diversity still need to be clarified. In 2009, a novel H1N1 virus originating in swine was first identified in Mexico. The virus spread rapidly and caused a pandemic with more than 22 million cases in the United States. The mortality rate was low (0.5%) in comparison with seasonal influenza strains [<xref ref-type="bibr" rid="CR73">73</xref>
]. Saudi Arabia was one of the countries affected by the virus, with 15,850 laboratory-confirmed cases and 124 deaths by December 2009 [<xref ref-type="bibr" rid="CR74">74</xref>
]. The first 100 cases in Saudi Arabia involved Saudis and Filipino travelers at King Khaled Airport during June 2009 [<xref ref-type="bibr" rid="CR74">74</xref>
]. Between July and September, H1N1 was detected in patients with influenza-like illnesses treated at King Khaled University Hospital in Riyadh [<xref ref-type="bibr" rid="CR75">75</xref>
]. In Riyadh, a prospective 6-month cohort study from July to December of 2009 included 1103 children (0-12 years of age) with influenza-like illness. Of these, 375 (34%) tested positive for H1N1, and 50 (13.3%) were hospitalized [<xref ref-type="bibr" rid="CR76">76</xref>
].</p>
<p id="Par16">During October and November, 2010, 12 (57%) patients hospitalized at Prince Mansour Military Hospital in Taif were H1N1 positive, and two patients died [<xref ref-type="bibr" rid="CR77">77</xref>
]. In Hail City, a retrospective study conducted throughout 2015 at King Khaled Hospital revealed 54 (18%) infections with H1N1 pdm09. The patients ranged in age from 7 months to 85 years [<xref ref-type="bibr" rid="CR78">78</xref>
]. In a prospective study conducted from June to November of 2009, 526 health care workers at King Abdul-aziz Medical City (Riyadh) tested positive for H1N1 pdm09 [<xref ref-type="bibr" rid="CR79">79</xref>
]. In another prospective study conducted from July 2009 to June 2010 at a tertiary-care hospital in Khamis Mushyt, 117 laboratory-confirmed cases of influenza A H1N1 pdm09 were reported. Forty-seven patients developed pneumonia, 22 were admitted to the intensive care unit, and 22 died [<xref ref-type="bibr" rid="CR80">80</xref>
]. Another study documented 47 laboratory-confirmed influenza A H1N1 pdm09 cases among hospitalized patients in a Saudi Arabian hospital [<xref ref-type="bibr" rid="CR81">81</xref>
]. These findings indicate the circulation and indigenous transmission of influenza A H1N1 pdm09 virus in Saudi Arabia.</p>
</sec>
</sec>
<sec id="Sec9"><title>HRSV</title>
<sec id="Sec10"><title>The virus</title>
<p id="Par17">HRSV is a member of the genus <italic>Orthopneumovirus</italic>
, family <italic>Pneumoviridae</italic>
, order <italic>Mononegavirales</italic>
, phylum <italic>Negarnaviricota</italic>
[<xref ref-type="bibr" rid="CR64">64</xref>
]. This order includes viruses with a negative-sense, non-segmented, and single-stranded RNA genome [<xref ref-type="bibr" rid="CR82">82</xref>
, <xref ref-type="bibr" rid="CR83">83</xref>
]. The HRSV genome ranges from 15,191 to 15,226 nucleotides in length [<xref ref-type="bibr" rid="CR84">84</xref>
] and codes for ten subgenomic mRNAs [<xref ref-type="bibr" rid="CR85">85</xref>
]. Based on the heterogeneity of the attachment glycoprotein gene, HRSV strains are classified antigenically into A and B subgroups [<xref ref-type="bibr" rid="CR86">86</xref>
].</p>
</sec>
<sec id="Sec11"><title>Epidemiology</title>
<p id="Par18">HRSV is a highly contagious virus that causes lower RTIs in humans of different ages. One study described the infection of 33.8 million children, with 3.4 million hospitalizations and nearly 199,000 deaths. Almost all (99%) of the cases were reported from developing countries [<xref ref-type="bibr" rid="CR87">87</xref>
]. In addition, HRSV infections have a great economic impact, with annual direct medical costs having been estimated at $650 million in the United States alone [<xref ref-type="bibr" rid="CR88">88</xref>
]. Neonates and infants under 5 years of age are more prone to severe and even fatal HRSV infections [<xref ref-type="bibr" rid="CR23">23</xref>
]. Similarly, individuals with underlying risk factors, such as prematurity, bronchopulmonary dysplasia (BPD), and congenital heart disease, and those with natural or induced immunodeficiency are at high risk of severe HRSV infection [<xref ref-type="bibr" rid="CR89">89</xref>
].</p>
<p id="Par19">In comparison with other respiratory viruses, HRSV is the leading cause of lower RTIs in community and hospital studies [<xref ref-type="bibr" rid="CR90">90</xref>
, <xref ref-type="bibr" rid="CR91">91</xref>
]. The virus is responsible for a high percentage of hospital admissions of babies [<xref ref-type="bibr" rid="CR92">92</xref>
]. Evolution of new genotypes of HRSV strains usually leads to recurrent infections in infants [<xref ref-type="bibr" rid="CR93">93</xref>
]. However, subsequent infections in adults are generally less severe and are usually asymptomatic [<xref ref-type="bibr" rid="CR94">94</xref>
]. The seasonality of HRSV epidemics is influenced by a number of factors, including climate, geographical region, virus dynamics, and social behavior. The epidemic period may extend for 1 to 5 months, depending on the geographic region involved [<xref ref-type="bibr" rid="CR95">95</xref>
, <xref ref-type="bibr" rid="CR96">96</xref>
]. Both group A and group B HRSV can co-circulate during epidemics, with group A isolates often being more prevalent than group B [<xref ref-type="bibr" rid="CR20">20</xref>
, <xref ref-type="bibr" rid="CR95">95</xref>
, <xref ref-type="bibr" rid="CR97">97</xref>
]. However, there is a regular change of the circulating strains/groups and emergence/disappearance of new lineages [<xref ref-type="bibr" rid="CR98">98</xref>
].</p>
<p id="Par20">Several studies have been conducted in Saudi Arabia to detect HRSV in clinical samples collected from hospitalized patients in different provinces (Table <xref rid="Tab2" ref-type="table">2</xref>
). These studies utilized immunofluorescence, ELISA, conventional RT-PCR, and real-time PCR assays and produced highly variable results, ranging from 4.7% to 83%. The prevalence of HRSV was generally high and usually was the leading cause of viral respiratory disease. In our laboratory, the circulation patterns of both groups of HRSV were examined. In addition, the virus was isolated and characterized for the first time in Saudi Arabia. Moreover, the genetic diversity, molecular and phylogenetic analysis of group A and B HRSV were studied [<xref ref-type="bibr" rid="CR20">20</xref>
, <xref ref-type="bibr" rid="CR21">21</xref>
]. Based on sequence analysis of the second hypervariable region of the G gene, we found that all Saudi HRSV B strains belonged to the genotype BA, which is characterized by a 60-nucleotide duplication.<table-wrap id="Tab2"><label>Table 2</label>
<caption><p>Record of HRSV in Saudi Arabia</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left">Year</th>
<th align="left">City/province</th>
<th align="left">Hospital</th>
<th align="left">No. of samples</th>
<th align="left">Detection test</th>
<th align="left">No. positive (%)</th>
<th align="left">Type</th>
<th align="left">References</th>
</tr>
</thead>
<tbody><tr><td align="left">1993</td>
<td align="left">Riyadh</td>
<td align="left">KKUH</td>
<td align="left">127</td>
<td align="left">IFA</td>
<td align="left">69 (54)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR153">153</xref>
]</td>
</tr>
<tr><td align="left">1996</td>
<td align="left">Riyadh</td>
<td align="left">SCH</td>
<td align="left">74</td>
<td align="left">IFA</td>
<td align="left">52 (70)</td>
<td align="left"></td>
<td align="left">[<xref ref-type="bibr" rid="CR154">154</xref>
]</td>
</tr>
<tr><td align="left">1998</td>
<td align="left">Riyadh</td>
<td align="left">KFSHRC</td>
<td align="left">256</td>
<td align="left">ND</td>
<td align="left">73 (28.5)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR118">118</xref>
]</td>
</tr>
<tr><td align="left">1998</td>
<td align="left">Riyadh</td>
<td align="left">KKUH</td>
<td align="left">522</td>
<td align="left">ND</td>
<td align="left">412 (79)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR114">114</xref>
]</td>
</tr>
<tr><td align="left">2002</td>
<td align="left">Riyadh</td>
<td align="left">KKUH</td>
<td align="left">20</td>
<td align="left">ND</td>
<td align="left">8 (40)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR155">155</xref>
]</td>
</tr>
<tr><td align="left">2004</td>
<td align="left">Mecca-Hajj</td>
<td align="left">KAUH</td>
<td align="left">500</td>
<td align="left">IFA</td>
<td align="left">4 (7.4)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR148">148</xref>
]</td>
</tr>
<tr><td align="left">2005</td>
<td align="left">Abha</td>
<td align="left">ACH</td>
<td align="left">51</td>
<td align="left">ELISA/IFA</td>
<td align="left">20 (40)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR115">115</xref>
]</td>
</tr>
<tr><td align="left">2005</td>
<td align="left">Riyadh</td>
<td align="left">KKUH</td>
<td align="left">4575</td>
<td align="left">IFA</td>
<td align="left">884 (19)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR156">156</xref>
]</td>
</tr>
<tr><td align="left">2006</td>
<td align="left">Al-Qassim</td>
<td align="left">BMPH</td>
<td align="left">282</td>
<td align="left">IFA</td>
<td align="left">128 (45)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR157">157</xref>
]</td>
</tr>
<tr><td align="left">2008</td>
<td align="left">Mecca-Hajj</td>
<td align="left">BHDMC</td>
<td align="left">205</td>
<td align="left">RT-PCR</td>
<td align="left">9 (4)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR143">143</xref>
]</td>
</tr>
<tr><td align="left">2009</td>
<td align="left">Riyadh</td>
<td align="left">KAMC</td>
<td align="left">10,617</td>
<td align="left">IFA</td>
<td align="left">733 (83)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR158">158</xref>
]</td>
</tr>
<tr><td align="left">2009</td>
<td align="left">Riyadh</td>
<td align="left">KKUH</td>
<td align="left">200</td>
<td align="left">RT-PCR</td>
<td align="left">70 (35)</td>
<td align="left"><p>A (57%)</p>
<p>B (42.9%)</p>
</td>
<td align="left">[<xref ref-type="bibr" rid="CR159">159</xref>
]</td>
</tr>
<tr><td align="left">2012</td>
<td align="left">Jeddah</td>
<td align="left">KAIA</td>
<td align="left">2699</td>
<td align="left"><p>xTAG RVP</p>
<p>FAST</p>
</td>
<td align="left">8 (0.2)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR160">160</xref>
]</td>
</tr>
<tr><td align="left">2014</td>
<td align="left">Najran</td>
<td align="left">NMCH</td>
<td align="left">135</td>
<td align="left">RT-PCR</td>
<td align="left">33(30.3)</td>
<td align="left"><p>A (27.5%)</p>
<p>B (2.8%)</p>
</td>
<td align="left">[<xref ref-type="bibr" rid="CR120">120</xref>
]</td>
</tr>
<tr><td align="left">2016</td>
<td align="left">Riyadh</td>
<td align="left">KKUH, KFMC</td>
<td align="left">130</td>
<td align="left">RT-PCR</td>
<td align="left">35 (27)</td>
<td align="left"><p>A (77%)</p>
<p>B (23%)</p>
</td>
<td align="left">[<xref ref-type="bibr" rid="CR161">161</xref>
]</td>
</tr>
<tr><td align="left">2017</td>
<td align="left">Jazan</td>
<td align="left">HCC-Jazan</td>
<td align="left">182</td>
<td align="left">RT-PCR /microarray</td>
<td align="left">13.6</td>
<td align="left"><p>A (3.4%)</p>
<p>B (10.2%)</p>
</td>
<td align="left">[<xref ref-type="bibr" rid="CR162">162</xref>
]</td>
</tr>
<tr><td align="left">2018</td>
<td align="left">Riyadh</td>
<td align="left">KAMC</td>
<td align="left">1115</td>
<td align="left">DFA</td>
<td align="left">1086 (97.4)</td>
<td align="left">-</td>
<td align="left">[<xref ref-type="bibr" rid="CR163">163</xref>
]</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p>KKUH, King Khaled University Hospital; KFHRC, King Faisal Specialized Hospital and Research Center; KAUH, King Abdu-Aziz University Hospital; ACH, Assir Central Hospital; BMPH, Buraidah Maternity and Pediatric Hospital; KAMC, King Abdul-aziz Medical City; KFMC, King Fahad Medical City; SCH, Suleimania Children’s Hospital; KAIA, King Abdul-aziz International Airport; NMCH, Najran Maternity and Children’s Hospital</p>
</table-wrap-foot>
</table-wrap>
</p>
<p id="Par21">The predominant genotype of HRSV A during 2007/08 and 2008/09 was NA1 [<xref ref-type="bibr" rid="CR21">21</xref>
]. Recently, we reported the circulation of the ON1 genotype in Saudi Arabia during 2014/15 and 2015/16 (unpublished data, GenBank accession numbers MH388029 to MH388042). This genotype is characterized by a 72-nucleotide duplication in the C-terminal region of the G gene. ON1 was first detected in Ontario, Canada [<xref ref-type="bibr" rid="CR99">99</xref>
], and was subsequently reported in several other countries. The demographic features associated with virus infection were also investigated. Infants younger than 6 months of age are the most affected age group, and males are infected more often than females [<xref ref-type="bibr" rid="CR21">21</xref>
]. In Saudi Arabia, HRSV infection tends to peak from October to March [<xref ref-type="bibr" rid="CR23">23</xref>
, <xref ref-type="bibr" rid="CR100">100</xref>
, <xref ref-type="bibr" rid="CR101">101</xref>
].</p>
</sec>
</sec>
<sec id="Sec12"><title>Human parainfluenza viruses (HPIVs)</title>
<sec id="Sec13"><title>The virus</title>
<p id="Par22">PIVs are members of the family <italic>Paramyxoviridae</italic>
, order <italic>Mononegavirales</italic>
. There are four genetically and antigenically different HPIVs distributed in two genera. The genus <italic>Respirovirus</italic>
includes human respirovirus 1 (formerly HPIV-1) and human respirovirus 3 (formerly HPIV-3). The genus <italic>Orthorubulavirus</italic>
includes human orthorubulavirus 2 (formerly HPIV-2) and human orthorubulavirus 4 (formerly HPIV-4) [<xref ref-type="bibr" rid="CR102">102</xref>
]. The genome of HPIV is single-stranded, non-segmented, and negative-sense and ranges in size from 15,300 to 17,400 nucleotides. The genome is enclosed within an enveloped helical nucleocapsid.</p>
</sec>
<sec id="Sec14"><title>Epidemiology</title>
<p id="Par23">HPIVs are important human pathogens causing acute upper and lower RTIs with varying degrees of severity. Of the four types, HPIV-1, -2, and -3 have been frequently detected in RTI outbreaks, particular in institutional settings [<xref ref-type="bibr" rid="CR18">18</xref>
, <xref ref-type="bibr" rid="CR19">19</xref>
, <xref ref-type="bibr" rid="CR103">103</xref>
]. HPIV-4 causes mild respiratory symptoms and has not been frequently detected in outbreaks and is therefore regarded as a less clinically important strain [<xref ref-type="bibr" rid="CR104">104</xref>
–<xref ref-type="bibr" rid="CR106">106</xref>
]. HPIV infections are characterized by croup (acute laryngotracheobronchitis), bronchiolitis, pneumonia, tracheobronchitis, and febrile and afebrile wheezing [<xref ref-type="bibr" rid="CR101">101</xref>
]. In the USA and the United Kingdom, the epidemiology of HPIV has been elucidated. In the USA, HPIVs account for approximately 1.7 million annual infections in children younger than 5 years of age [<xref ref-type="bibr" rid="CR107">107</xref>
, <xref ref-type="bibr" rid="CR108">108</xref>
]. They are also responsible for up to 17% of hospitalizations caused by acute RTIs in children younger than 5 years of age [<xref ref-type="bibr" rid="CR109">109</xref>
, <xref ref-type="bibr" rid="CR110">110</xref>
]. In the UK, a retrospective study including 8221 PIV-infected cases over a 12-year period revealed that HPIV-1, -2, -3 and -4 accounted for 17.2%, 70.8%, 7.5%, and 1.1%, respectively, of the reported cases. Of these cases, 64.1% were infants under one year of age, 24.4% were children aged 1 to 4 years, and 7.2% were patients aged 5 years or older [<xref ref-type="bibr" rid="CR111">111</xref>
].</p>
<p id="Par24">HPIV infections are detected throughout the year at low frequency [<xref ref-type="bibr" rid="CR112">112</xref>
]. Seasonal patterns vary based on the virus type. The reason for the variation is unclear and may involve climate change [<xref ref-type="bibr" rid="CR107">107</xref>
]. HPIV-1 and HPIV-2 have been reported to cause biennial fall epidemics and may circulate concurrently with HPIV-2, causing annual outbreaks [<xref ref-type="bibr" rid="CR113">113</xref>
]. Spring and summer epidemics of HPIV-3 have been reported in North America and Europe [<xref ref-type="bibr" rid="CR102">102</xref>
].</p>
<p id="Par25">In Saudi Arabia, data concerning the epidemiology of HPIV are scarce. The circulation of HPIVs was documented in a number of provinces, including Abha, Qassim, and Riyadh [<xref ref-type="bibr" rid="CR101">101</xref>
, <xref ref-type="bibr" rid="CR114">114</xref>
–<xref ref-type="bibr" rid="CR116">116</xref>
]. In Riyadh, a total of 1429 Saudi children were admitted to King Khaled University Hospital between April 1993 and March 1996 with RTIs. Among these, 522 (37%) were identified to be caused by viruses. HPIV-3 was detected in 42 cases (8%). The authors also reported that HPIV-3 could be detected in all months, with epidemics during June to August, when the air temperature was 40 °C [<xref ref-type="bibr" rid="CR18">18</xref>
]. In another study, HPIVs were detected in nasopharyngeal aspirates collected from infants and young children admitted to the Buraidah Maternity and Pediatric Hospital, Al-Qassim, Saudi Arabia, during the winter season of 2003/2004. Among 282 screened samples, the frequency of HPIV-1, -2, and -3 was 9 (3.2%), 4 (1.4 %), and 1 (0.4 %), respectively [<xref ref-type="bibr" rid="CR116">116</xref>
].</p>
<p id="Par26">In our laboratory, the circulation pattern of HPIVs in Saudi patients treated at King Khaled University Hospital was examined. HPIVs in nasopharyngeal aspirates collected from hospitalized children during two consecutive seasons (2007/08 and 2008/09) were screened using RT-PCR. Of 180 samples, 10 (5.56%) contained HPIV-3 [<xref ref-type="bibr" rid="CR18">18</xref>
] and contained (0.56%) was HPIV-2 [<xref ref-type="bibr" rid="CR18">18</xref>
]. In addition, we investigated the genetic characteristics and phylogeny of Saudi HPIV-3 strains by sequencing the entire hemagglutinin-neuraminidase gene. HPIV-3 strains displayed sequence similarity to strains from India, China, and Japan. A distinct Asian lineage was inferred from phylogenetic analysis [<xref ref-type="bibr" rid="CR17">17</xref>
, <xref ref-type="bibr" rid="CR19">19</xref>
]. Phylogenetic analysis showed that a Saudi strain of HPIV-2 was related to a strain reported in the US state of Oklahoma [<xref ref-type="bibr" rid="CR18">18</xref>
].</p>
</sec>
</sec>
<sec id="Sec15"><title>Other respiratory viruses</title>
<p id="Par27">Human metapneumovirus (hMPV), a member of the family <italic>Pneumoviridae</italic>
, is an enveloped virus with a negative-sense, non-segmented and single-stranded RNA genome. The virus was first reported in 2001 and was identified as a common cause of upper and lower RTIs in young children, the elderly, and immune-compromised individuals. The virus is responsible for approximately 5% to 10% of hospitalizations of children due to severe bronchiolitis and pneumonia. We investigated the epidemiology and genetic diversity of hMPV in Saudi children hospitalized in Riyadh. The virus was detected in 19 (10.9%) of 174 nasopharyngeal airway samples and was found to be the third major cause of RTI after HRSV (n = 39, 22.4%) and influenza A virus (n = 34, 19.5%). Males (n = 14, 73.7%) were more frequently infected than females (n = 5, 26.3%). Children younger than 2 years of age were the most affected group [<xref ref-type="bibr" rid="CR23">23</xref>
].</p>
<p id="Par28">To identify hMPV lineages circulating in Riyadh, phylogenetic analysis was performed using the full-length G gene and a partial sequence of the F gene. We found that all hMPV subgenotypes and lineages, except A1, circulated in Riyadh [<xref ref-type="bibr" rid="CR22">22</xref>
]. Worldwide, hMPV usually peaks in winter and spring [<xref ref-type="bibr" rid="CR117">117</xref>
, <xref ref-type="bibr" rid="CR118">118</xref>
]. In Saudi Arabia, the epidemiology data of hMPV are very limited [<xref ref-type="bibr" rid="CR119">119</xref>
, <xref ref-type="bibr" rid="CR120">120</xref>
]. hMPV usually has broad seasonal peaks. In one study, the virus was most frequently reported from January to March [<xref ref-type="bibr" rid="CR23">23</xref>
], while another study reported hMPV peaks in March, August, and September [<xref ref-type="bibr" rid="CR119">119</xref>
]. Some other studies that reported the prevalence of hMPV in Saudi Arabia are listed in Table <xref rid="Tab3" ref-type="table">3</xref>
.<table-wrap id="Tab3"><label>Table 3</label>
<caption><p>Record of infection with other respiratory viruses in different districts of Saudi Arabia</p>
</caption>
<table frame="hsides" rules="groups"><thead><tr><th align="left">Virus</th>
<th align="left">Total number (+ samples)</th>
<th align="left">Collection season</th>
<th align="left">Virus (%)</th>
<th align="left">Sample type</th>
<th align="left">Test</th>
<th align="left">Hospital<sup>*</sup>
</th>
<th align="left">References</th>
</tr>
</thead>
<tbody><tr><td align="left">Human AdV</td>
<td align="left">950 (256)</td>
<td align="left">August 1993-July 1996</td>
<td align="left">70 (27.3)</td>
<td align="left"><p>Throat</p>
<p>swabs, NPA, BAL</p>
</td>
<td align="left">DFA/TC</td>
<td align="left">KFSHRC, Riyadh</td>
<td align="left">[<xref ref-type="bibr" rid="CR114">114</xref>
]</td>
</tr>
<tr><td align="left">Human MPV</td>
<td align="left" rowspan="2">489 (144)</td>
<td align="left" rowspan="2">July 2007 to November 2008</td>
<td align="left">12 (8.3)</td>
<td align="left" rowspan="2">NPA/BAL</td>
<td align="left" rowspan="2">RT-PCR</td>
<td align="left" rowspan="2">KFSHRC, Riyadh</td>
<td align="left" rowspan="2">[<xref ref-type="bibr" rid="CR119">119</xref>
]</td>
</tr>
<tr><td align="left">HCoV-NL63</td>
<td align="left">4 (2.8)</td>
</tr>
<tr><td align="left">Human bocavirus</td>
<td align="left">80 (18)</td>
<td align="left">January to May 2012</td>
<td align="left">18 (22.5)</td>
<td align="left">NPA</td>
<td align="left">Real-time RT-PCR</td>
<td align="left">GPH-Al-Taif</td>
<td align="left">[<xref ref-type="bibr" rid="CR164">164</xref>
]</td>
</tr>
<tr><td align="left">Human MPV</td>
<td align="left">98 (9)</td>
<td align="left">-</td>
<td align="left">9 (9.18)</td>
<td align="left">Swabs</td>
<td align="left">DFA</td>
<td align="left">ACH, Aseer</td>
<td align="left">[<xref ref-type="bibr" rid="CR165">165</xref>
]</td>
</tr>
<tr><td align="left">Human MPV</td>
<td align="left">174 (19)</td>
<td align="left"><p>February</p>
<p>2008 to March 2009</p>
</td>
<td align="left">19 (10.9)</td>
<td align="left">NPA</td>
<td align="left">Real-time RT-PCR</td>
<td align="left">KKUH, Riyadh</td>
<td align="left">[<xref ref-type="bibr" rid="CR22">22</xref>
]</td>
</tr>
<tr><td align="left">Human AdV</td>
<td align="left">4611 (1115)</td>
<td align="left">January 2013 and December 2014</td>
<td align="left">3 (0.3)</td>
<td align="left">-</td>
<td align="left">DFA</td>
<td align="left">KAMC, Riyadh</td>
<td align="left">[<xref ref-type="bibr" rid="CR163">163</xref>
]</td>
</tr>
<tr><td align="left">Human AdV</td>
<td align="left" rowspan="6">135 (100)</td>
<td align="left" rowspan="6">October 2012 and July 2013</td>
<td align="left">19 (17.4)</td>
<td align="left" rowspan="6">Nasopharyngeal swabs</td>
<td align="left" rowspan="6">Multiplex RT-PCR</td>
<td align="left" rowspan="6">NMCH, Najran</td>
<td align="left" rowspan="6">[<xref ref-type="bibr" rid="CR120">120</xref>
]</td>
</tr>
<tr><td align="left">Human MPV</td>
<td align="left">13 (11.9)</td>
</tr>
<tr><td align="left">Human BV</td>
<td align="left">1 (0.9)</td>
</tr>
<tr><td align="left">Human RV</td>
<td align="left">22 (20.2)</td>
</tr>
<tr><td align="left">HCoV-NL63</td>
<td align="left">2 (1.8)</td>
</tr>
<tr><td align="left">HCoV-OC43</td>
<td align="left">2 (1.8)</td>
</tr>
<tr><td align="left">Human RV</td>
<td align="left" rowspan="7">182 (88)</td>
<td align="left" rowspan="7">November 2013 and January 2014</td>
<td align="left">36 (40.9)</td>
<td align="left" rowspan="7">Nasal swabs</td>
<td align="left" rowspan="7">RT-PCR and multiplex microarray</td>
<td align="left" rowspan="7">Health care centers in Jazan province</td>
<td align="left" rowspan="7">[<xref ref-type="bibr" rid="CR162">162</xref>
]</td>
</tr>
<tr><td align="left">HCoV-OC43</td>
<td align="left">14 (15.9)</td>
</tr>
<tr><td align="left">HCoV-NL63</td>
<td align="left">1 (1.1)</td>
</tr>
<tr><td align="left">HCoV-HKU1</td>
<td align="left">2 (2.3)</td>
</tr>
<tr><td align="left">Human AdV</td>
<td align="left">5 (5.7)</td>
</tr>
<tr><td align="left">Enterovirus</td>
<td align="left">3 (3.4)</td>
</tr>
<tr><td align="left">Human MPV</td>
<td align="left">1 (1.1)</td>
</tr>
<tr><td align="left">Human AdV</td>
<td align="left">761 (148)</td>
<td align="left">Hajj season</td>
<td align="left">36 (24.3)</td>
<td align="left">Throat swabs, sputum</td>
<td align="left">Cell culture/CPE/ immunostaining</td>
<td align="left">MC, Mecca</td>
<td align="left">[<xref ref-type="bibr" rid="CR166">166</xref>
]</td>
</tr>
<tr><td align="left">Human RV</td>
<td align="left">260 (52)</td>
<td align="left">Hajj season</td>
<td align="left">48 (92)</td>
<td align="left">Nasal swabs</td>
<td align="left">PCR</td>
<td align="left">NGHAC, Mina</td>
<td align="left">[<xref ref-type="bibr" rid="CR143">143</xref>
]</td>
</tr>
<tr><td align="left">Human AdV</td>
<td align="left" rowspan="3">1038 (42)</td>
<td align="left" rowspan="3">Hajj season</td>
<td align="left">2 (2)</td>
<td align="left" rowspan="3"><p>Nasopharyngeal</p>
<p>or throat swabs</p>
</td>
<td align="left" rowspan="3">Multiplex RT-PCR</td>
<td align="left" rowspan="3"><p>Mina</p>
<p>encampment</p>
</td>
<td align="left" rowspan="3">[<xref ref-type="bibr" rid="CR135">135</xref>
]</td>
</tr>
<tr><td align="left">Human RV</td>
<td align="left">28 (25)</td>
</tr>
<tr><td align="left">HCoV-OC43,- 229E</td>
<td align="left">2 (2)</td>
</tr>
<tr><td align="left">Human RV</td>
<td align="left" rowspan="2">38 (26)</td>
<td align="left" rowspan="2">Hajj season</td>
<td align="left">15 (57.7)</td>
<td align="left" rowspan="2">Sputum</td>
<td align="left" rowspan="2">PCR</td>
<td align="left" rowspan="2">MC, Mecca</td>
<td align="left" rowspan="2">[<xref ref-type="bibr" rid="CR52">52</xref>
]</td>
</tr>
<tr><td align="left">HCoV</td>
<td align="left">5 (19.2)</td>
</tr>
</tbody>
</table>
<table-wrap-foot><p><sup>*</sup>
KFSHRC, King Faisal Specialist Hospital and Research Center; ACH, Asser Central Hospital; KAMC, King Abdul-Aziz Medical City; NMCH, Najran Maternity and Children’s Hospital; NGHA, National Guard Health Affairs; KKUH, King Khaled University Hospital; MC, Medical Center</p>
</table-wrap-foot>
</table-wrap>
</p>
<p id="Par29">Human rhinovirus, a member of the family <italic>Picornaviridae</italic>
, has a single-stranded, positive-sense RNA genome enclosed within a naked capsid. HRV has been reported to cause upper RTIs and some lower RTIs in children [<xref ref-type="bibr" rid="CR121">121</xref>
]. Epidemiological studies in Saudi Arabia have shown that hRV infects people of all ages [<xref ref-type="bibr" rid="CR119">119</xref>
, <xref ref-type="bibr" rid="CR120">120</xref>
].</p>
<p id="Par30">Another causative agent of viral RTIs is human adenovirus (hAdV). It is a double standard, non-enveloped DNA virus with more than 50 serotypes. The virus has no seasonal variation and can infect humans throughout the year. hAdV accounts for 5% to 10% of acute lower RTIs in children [<xref ref-type="bibr" rid="CR122">122</xref>
, <xref ref-type="bibr" rid="CR123">123</xref>
]. In Saudi Arabia, one study reported that children 1-3 years of age were infected more frequently than younger or older children [<xref ref-type="bibr" rid="CR114">114</xref>
]. Table <xref rid="Tab3" ref-type="table">3</xref>
summarizes data concerning hMPV, hAdV, hRV, HCoV, and bocavirus RTIs in Saudi Arabia.</p>
</sec>
<sec id="Sec16"><title>Respiratory viruses and the Hajj season</title>
<sec id="Sec17"><title>Detection of respiratory viruses in pilgrims</title>
<p id="Par31">During the Hajj season, acute respiratory infections account for 57% of hospitalizations [<xref ref-type="bibr" rid="CR124">124</xref>
–<xref ref-type="bibr" rid="CR127">127</xref>
]. Detection of respiratory viruses among more than 14,000 pilgrims over seven consecutive Hajj seasons has revealed that influenza A viruses were the most frequently detected viruses, followed by HRSV, HPIVs, rhinoviruses, non-MERS CoVs, and metapneumoviruses [<xref ref-type="bibr" rid="CR128">128</xref>
]. Therefore, studying respiratory viruses circulating among pilgrims is important to prevent serious consequences, particularly with elderly and immunocompromised individuals. To investigate nasal carriage of MERS-CoV among Hajj pilgrims, 5235 nasopharyngeal samples were collected from pilgrims of 22 countries pre- and post-Hajj. Samples were screened by PCR. None of the tested samples were positive [<xref ref-type="bibr" rid="CR129">129</xref>
]. Similarly, MERS-CoV was not detected in Hajj returnees to France [<xref ref-type="bibr" rid="CR14">14</xref>
], Austria [<xref ref-type="bibr" rid="CR130">130</xref>
], North India [<xref ref-type="bibr" rid="CR131">131</xref>
], China [<xref ref-type="bibr" rid="CR132">132</xref>
], Jordan [<xref ref-type="bibr" rid="CR133">133</xref>
], Egypt [<xref ref-type="bibr" rid="CR134">134</xref>
], or Qatar [<xref ref-type="bibr" rid="CR135">135</xref>
]. These findings do not exclude the possibility of human-to-human transmission.</p>
<p id="Par32">Several studies were also carried out to detect influenza viruses circulating during the Hajj seasons [<xref ref-type="bibr" rid="CR136">136</xref>
–<xref ref-type="bibr" rid="CR140">140</xref>
]. In these studies, the virus was detected in different types of samples, including throat swabs, nasal swabs, nasopharyngeal swabs, sputum, bronchoalveolar and nasopharyngeal aspirates, gargled pharyngeal secretions, and serum. These studies do not reflect the real situation of influenza in the kingdom because they are mainly focused on pilgrims. In addition, these studies included pilgrims of different nationalities [<xref ref-type="bibr" rid="CR12">12</xref>
, <xref ref-type="bibr" rid="CR52">52</xref>
, <xref ref-type="bibr" rid="CR127">127</xref>
, <xref ref-type="bibr" rid="CR130">130</xref>
, <xref ref-type="bibr" rid="CR141">141</xref>
–<xref ref-type="bibr" rid="CR143">143</xref>
]. H1N1 was detected among pilgrims of the 2009 Hajj season [<xref ref-type="bibr" rid="CR144">144</xref>
]. In a prospective cohort study during the 2009 Hajj season, 110 critically ill patients in four hospitals were involved. Of these, 11 (10%) displayed severe H1N1 infections [<xref ref-type="bibr" rid="CR145">145</xref>
]. In Mecca and during the Hajj season of 2010, 120 (7.5%) of 1,500 pilgrims were confirmed to have H1N1 pdm09 infection [<xref ref-type="bibr" rid="CR137">137</xref>
]. Similarly, HRSV [<xref ref-type="bibr" rid="CR140">140</xref>
, <xref ref-type="bibr" rid="CR142">142</xref>
, <xref ref-type="bibr" rid="CR143">143</xref>
, <xref ref-type="bibr" rid="CR146">146</xref>
–<xref ref-type="bibr" rid="CR148">148</xref>
] and HPIVs [<xref ref-type="bibr" rid="CR12">12</xref>
, <xref ref-type="bibr" rid="CR14">14</xref>
, <xref ref-type="bibr" rid="CR135">135</xref>
, <xref ref-type="bibr" rid="CR139">139</xref>
, <xref ref-type="bibr" rid="CR148">148</xref>
, <xref ref-type="bibr" rid="CR149">149</xref>
] were frequently detected during the Hajj season.</p>
</sec>
<sec id="Sec18"><title>Transmission of respiratory viruses beyond the Hajj season</title>
<p id="Par33">During the Hajj season, millions of Muslims gather in Mecca in the largest annual mass congregation worldwide. In such overcrowded conditions, respiratory viruses spread easily. Several studies have documented the increased rate of viral respiratory infections among pilgrims [<xref ref-type="bibr" rid="CR12">12</xref>
, <xref ref-type="bibr" rid="CR135">135</xref>
, <xref ref-type="bibr" rid="CR141">141</xref>
, <xref ref-type="bibr" rid="CR143">143</xref>
, <xref ref-type="bibr" rid="CR146">146</xref>
]. Upon return to their home countries, pilgrims act as potential foci for spread of new viruses among susceptible populations. Transmission of these viruses in a so-called ‘virgin soil’ has serious consequences and may result in global outbreaks and/or pandemics (examples: MERS-CoV and influenza A viruses). Therefore, several countries routinely screen Hajj returnees, particularly those developing or showing signs of respiratory illness. For instance, influenza virus was identified in 64% of the pilgrims returning to France after the Hajj season of 2011/2012 [<xref ref-type="bibr" rid="CR150">150</xref>
]. In prospective studies on French pilgrims, a significantly higher percentage of returning pilgrims had respiratory virus infections than before travelling to Saudi Arabia [<xref ref-type="bibr" rid="CR12">12</xref>
, <xref ref-type="bibr" rid="CR151">151</xref>
].</p>
<p id="Par34">In the UK, among 202 returning pilgrims/travelers, 28 (13.8%) were infected with influenza A virus, 13 (6.4%) with influenza B virus, 29 (14%) with rhinovirus, 10 (4.9%) with parainfluenza viruses, 10 (4.9%) with adenovirus, five (2.4%) with RSV, and three (1.4%) with human metapneumovirus [<xref ref-type="bibr" rid="CR152">152</xref>
]. In Ghana, a total of 651 out of 839 (77.6%) returning pilgrims were suffering from ARTIs. Rhinovirus was detected in 141 returnees, RSV in 43, and influenza A virus in 11. Coinfection with more than one respiratory virus was reported in 1.9% of the tested returnees [<xref ref-type="bibr" rid="CR147">147</xref>
]. In Iran, a total of 275 (out of 3000) pilgrim returnees with flu-like symptoms were tested. Influenza A viruses were detected in 13 (8 H1N1 and 5 H3N2), and 20 tested positive for influenza B virus [<xref ref-type="bibr" rid="CR142">142</xref>
]. In Austria, five pilgrims were influenza positive and two were infected by rhinovirus [<xref ref-type="bibr" rid="CR130">130</xref>
]. In India, 22 hajj returnees tested positive for influenza A virus (13 H3N2 and 9 H1N1), and 11 were positive for influenza B/Yamagata [<xref ref-type="bibr" rid="CR131">131</xref>
].</p>
<p id="Par35">From the above-mentioned studies, it is clear that rhinoviruses and influenza viruses (A and B) are the most prominent among Hajj returnees. The absence of MERS-CoV among Hajj returnees does not exclude the possibility of its nasal carriage to other countries. Studies performed before, during and after the Hajj season support the notion that pilgrimage contributes to the epidemiology of respiratory viruses. Hajj returnees could also transmit these viruses into different parts of Saudi Arabia through domestic pilgrims or globally through international pilgrims. Therefore, it is recommended for pilgrims to follow the vaccination regimen approved by the Saudi Ministry of Health and CDC.</p>
</sec>
</sec>
<sec id="Sec19"><title>Conclusions</title>
<p id="Par36">In an era of rapid global travel, viruses have no borders and can traverse countries and even continents within a few hours. Airports and other ports of entry to Saudi Arabia witness a dynamic movement of millions of pilgrims and foreign workers throughout the year. These huge numbers of people have different ethnicities, underlying clinical conditions, and socioeconomic backgrounds. They vary in their susceptibility to respiratory virus infections and represent a potential source of virus transmission to the Kingdom of Saudi Arabia. Control measures at different ports of entry are a prudent strategy, particularly during the winter and Hajj seasons. In addition, pilgrims should be advised to follow vaccination programs before performing the Hajj ritual. This will help to reduce the spread of virus beyond the Hajj season, both to other parts of Saudi Arabia by domestic pilgrims and to other countries by international pilgrims. More research studies that clarify the epidemiology, phylogeny, and evolution of respiratory viruses are urgently required to predict and reduce the impact of future epidemics.</p>
</sec>
</body>
<back><fn-group><fn><p><bold>Publisher's Note</bold>
</p>
<p>Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.</p>
</fn>
</fn-group>
<ack><title>Acknowledgment</title>
<p>The authors thank the Deanship of Scientific Research and RSSU at King Saud University for their technical support.</p>
</ack>
<notes notes-type="ethics"><title>Compliance with ethical standards</title>
<notes notes-type="COI-statement"><title>Conflict of interest</title>
<p id="Par37">The authors declare that they have no conflicts of interest.</p>
</notes>
</notes>
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