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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Middle East respiratory syndrome coronavirus (MERS-CoV): Prevention in travelers</title><author><name sortKey="Pavli, Androula" sort="Pavli, Androula" uniqKey="Pavli A" first="Androula" last="Pavli">Androula Pavli</name><affiliation><nlm:aff id="aff1">Travel Medicine Office, Athens, Greece</nlm:aff></affiliation></author><author><name sortKey="Tsiodras, Sotirios" sort="Tsiodras, Sotirios" uniqKey="Tsiodras S" first="Sotirios" last="Tsiodras">Sotirios Tsiodras</name><affiliation><nlm:aff id="aff3">Hellenic Center for Disease Control and Prevention, Athens, Greece</nlm:aff></affiliation><affiliation><nlm:aff id="aff4">University of Athens Medical School, Athens, Greece</nlm:aff></affiliation></author><author><name sortKey="Maltezou, Helena C" sort="Maltezou, Helena C" uniqKey="Maltezou H" first="Helena C." last="Maltezou">Helena C. Maltezou</name><affiliation><nlm:aff id="aff2">Department for Interventions in Health Care Facilities, Athens, Greece</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">25457301</idno><idno type="pmc">7110598</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7110598</idno><idno type="RBID">PMC:7110598</idno><idno type="doi">10.1016/j.tmaid.2014.10.006</idno><date when="2014">2014</date><idno type="wicri:Area/Pmc/Corpus">001411</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">001411</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Middle East respiratory syndrome coronavirus (MERS-CoV): Prevention in travelers</title><author><name sortKey="Pavli, Androula" sort="Pavli, Androula" uniqKey="Pavli A" first="Androula" last="Pavli">Androula Pavli</name><affiliation><nlm:aff id="aff1">Travel Medicine Office, Athens, Greece</nlm:aff></affiliation></author><author><name sortKey="Tsiodras, Sotirios" sort="Tsiodras, Sotirios" uniqKey="Tsiodras S" first="Sotirios" last="Tsiodras">Sotirios Tsiodras</name><affiliation><nlm:aff id="aff3">Hellenic Center for Disease Control and Prevention, Athens, Greece</nlm:aff></affiliation><affiliation><nlm:aff id="aff4">University of Athens Medical School, Athens, Greece</nlm:aff></affiliation></author><author><name sortKey="Maltezou, Helena C" sort="Maltezou, Helena C" uniqKey="Maltezou H" first="Helena C." last="Maltezou">Helena C. Maltezou</name><affiliation><nlm:aff id="aff2">Department for Interventions in Health Care Facilities, Athens, Greece</nlm:aff></affiliation></author></analytic><series><title level="j">Travel Medicine and Infectious Disease</title><idno type="ISSN">1477-8939</idno><idno type="eISSN">1873-0442</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><title>Summary</title><p>Middle East respiratory syndrome coronavirus (MERS-CoV), a novel coronavirus that causes a severe lower respiratory tract infection in humans, emerged in the Middle East in 2012. Since then, MERS-CoV has caused an ongoing epidemic in the Arabian Peninsula with sporadic cases imported in Europe, North Africa, Southeast Asia, and the United States of America. As of 28th May 2014, 636 laboratory-confirmed cases of infection with MERS-CoV have been reported to World Health Organization including 14 cases imported by travelers. The epicenter of the current MERS-CoV epidemic is located in Saudi Arabia, where millions of pilgrims travel for two mass gatherings annually. In this review we summarize MERS-CoV cases in relation to travel with focus on the epidemiology and prevention in travelers. It is important to increase awareness of travelers about the risks and appropriate preventive measures and for health professionals to be on alert if a patient with severe respiratory symptoms reports a recent history of travel to the region affected with MERS-CoV. Measures should be taken by local health authorities of the affected countries in order to improve hospital hygiene. Finally, it is crucial to investigate the reasons for travelers' poor compliance with rules and recommendations issued by Saudi officials and to take appropriate measures in order to improve them.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Peiris, J S" uniqKey="Peiris J">J.S. Peiris</name></author><author><name sortKey="Guan, Y" uniqKey="Guan Y">Y. Guan</name></author><author><name sortKey="Yuen, K Y" uniqKey="Yuen K">K.Y. Yuen</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Hon, K L" uniqKey="Hon K">K.L. Hon</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Khan, K" uniqKey="Khan K">K. Khan</name></author><author><name sortKey="Arino, J" uniqKey="Arino J">J. Arino</name></author><author><name sortKey="Hu, W" uniqKey="Hu W">W. Hu</name></author><author><name sortKey="Raposo, P" uniqKey="Raposo P">P. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Travel Med Infect Dis</journal-id><journal-id journal-id-type="iso-abbrev">Travel Med Infect Dis</journal-id><journal-title-group><journal-title>Travel Medicine and Infectious Disease</journal-title></journal-title-group><issn pub-type="ppub">1477-8939</issn><issn pub-type="epub">1873-0442</issn><publisher><publisher-name>Elsevier Ltd.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">25457301</article-id><article-id pub-id-type="pmc">7110598</article-id><article-id pub-id-type="publisher-id">S1477-8939(14)00197-5</article-id><article-id pub-id-type="doi">10.1016/j.tmaid.2014.10.006</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Middle East respiratory syndrome coronavirus (MERS-CoV): Prevention in travelers</article-title></title-group><contrib-group><contrib contrib-type="author" id="au1"><name><surname>Pavli</surname><given-names>Androula</given-names></name><xref rid="aff1" ref-type="aff">a</xref></contrib><contrib contrib-type="author" id="au2"><name><surname>Tsiodras</surname><given-names>Sotirios</given-names></name><xref rid="aff3" ref-type="aff">c</xref><xref rid="aff4" ref-type="aff">d</xref></contrib><contrib contrib-type="author" id="au3"><name><surname>Maltezou</surname><given-names>Helena C.</given-names></name><email>helen-maltezou@ath.forthnet.gr</email><xref rid="aff2" ref-type="aff">b</xref><xref rid="cor1" ref-type="corresp">∗</xref></contrib></contrib-group><aff id="aff1"><label>a</label>Travel Medicine Office, Athens, Greece</aff><aff id="aff2"><label>b</label>Department for Interventions in Health Care Facilities, Athens, Greece</aff><aff id="aff3"><label>c</label>Hellenic Center for Disease Control and Prevention, Athens, Greece</aff><aff id="aff4"><label>d</label>University of Athens Medical School, Athens, Greece</aff><author-notes><corresp id="cor1"><label>∗</label>Corresponding author. Department for Interventions in Health-Care Facilities, Hellenic Centre for Disease Control and Prevention, 3-5 Agrafon Street, Athens 15123, Greece. Tel.: +30 210 5212 175; fax: +30 210 5212 177. <email>helen-maltezou@ath.forthnet.gr</email></corresp></author-notes><pub-date pub-type="pmc-release"><day>19</day><month>10</month><year>2014</year></pub-date><pmc-comment> PMC Release delay is 0 months and 0 days and was based on .</pmc-comment>
<pub-date pub-type="ppub" iso-8601-date="2014-12-01"><season>November-December</season><year>2014</year></pub-date><pub-date pub-type="epub"><day>19</day><month>10</month><year>2014</year></pub-date><volume>12</volume><issue>6</issue><fpage>602</fpage><lpage>608</lpage><history><date date-type="received"><day>5</day><month>6</month><year>2014</year></date><date date-type="rev-recd"><day>6</day><month>10</month><year>2014</year></date><date date-type="accepted"><day>9</day><month>10</month><year>2014</year></date></history><permissions><copyright-statement>Copyright © 2014 Elsevier Ltd. All rights reserved.</copyright-statement><copyright-year>2014</copyright-year><copyright-holder>Elsevier Ltd</copyright-holder><license><license-p>Since January 2020 Elsevier has created a COVID-19 resource centre with free information in English and Mandarin on the novel coronavirus COVID-19. The COVID-19 resource centre is hosted on Elsevier Connect, the company's public news and information website. Elsevier hereby grants permission to make all its COVID-19-related research that is available on the COVID-19 resource centre - including this research content - immediately available in PubMed Central and other publicly funded repositories, such as the WHO COVID database with rights for unrestricted research re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for free by Elsevier for as long as the COVID-19 resource centre remains active.</license-p></license></permissions><abstract id="abs0010"><title>Summary</title><p>Middle East respiratory syndrome coronavirus (MERS-CoV), a novel coronavirus that causes a severe lower respiratory tract infection in humans, emerged in the Middle East in 2012. Since then, MERS-CoV has caused an ongoing epidemic in the Arabian Peninsula with sporadic cases imported in Europe, North Africa, Southeast Asia, and the United States of America. As of 28th May 2014, 636 laboratory-confirmed cases of infection with MERS-CoV have been reported to World Health Organization including 14 cases imported by travelers. The epicenter of the current MERS-CoV epidemic is located in Saudi Arabia, where millions of pilgrims travel for two mass gatherings annually. In this review we summarize MERS-CoV cases in relation to travel with focus on the epidemiology and prevention in travelers. It is important to increase awareness of travelers about the risks and appropriate preventive measures and for health professionals to be on alert if a patient with severe respiratory symptoms reports a recent history of travel to the region affected with MERS-CoV. Measures should be taken by local health authorities of the affected countries in order to improve hospital hygiene. Finally, it is crucial to investigate the reasons for travelers' poor compliance with rules and recommendations issued by Saudi officials and to take appropriate measures in order to improve them.</p></abstract><kwd-group id="kwrds0010"><title>Keywords</title><kwd>MERS-CoV</kwd><kwd>Imported cases</kwd><kwd>Travelers</kwd><kwd>Prevention</kwd></kwd-group></article-meta></front><body><sec id="sec1"><label>1</label><title>Introduction</title><p id="p0010">International travel has increased dramatically over the past six decades; from 25 million in 1950, to 528 million in 1995, 1035 million in 2012 and is expected to reach 1.8 billion in 2030. In 2012, international tourist arrivals in the Middle East were estimated at 52 million <xref rid="bib1" ref-type="bibr">[1]</xref>. Travelers can be exposed to various infectious agents and may facilitate their spread across borders. The importance of travel in the dissemination of respiratory diseases <xref rid="bib2" ref-type="bibr">[2]</xref> has been demonstrated by the rapid worldwide spread of Severe Acute Respiratory Syndrome (SARS) outbreak in 2003 and the recent pandemic of influenza A (H1N1) in 2009 <xref rid="bib3" ref-type="bibr">[3]</xref>, <xref rid="bib4" ref-type="bibr">[4]</xref>.</p><p id="p0015">The Middle East respiratory syndrome coronavirus (MERS-CoV) was isolated for the first time from a Saudi patient with severe pneumonia and a fatal outcome in September 2012. Since then, MERS-CoV has caused an ongoing outbreak in the Arabian Peninsula <xref rid="bib5" ref-type="bibr">[5]</xref>, <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>, <xref rid="bib8" ref-type="bibr">[8]</xref> with sporadic cases imported in European, North African, Southeast Asian countries and USA <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib10" ref-type="bibr">[10]</xref>, <xref rid="bib11" ref-type="bibr">[11]</xref>, <xref rid="bib12" ref-type="bibr">[12]</xref>, <xref rid="bib13" ref-type="bibr">[13]</xref>, <xref rid="bib14" ref-type="bibr">[14]</xref>, <xref rid="bib15" ref-type="bibr">[15]</xref>, <xref rid="bib16" ref-type="bibr">[16]</xref>, <xref rid="bib17" ref-type="bibr">[17]</xref>. Coronaviruses are positive-sense RNA viruses. MERS-CoV belongs to <italic>Betacoronavirus</italic> phylogenetic lineage C that, in addition to MERS-CoV, contains 2 distinct bat-associated CoV species (HKU4 and HKU5) <xref rid="bib7" ref-type="bibr">[7]</xref>. As of 15th May 2014, globally, 572 laboratory-confirmed cases of infection with MERS-CoV have officially been reported to WHO, including 173 deaths <xref rid="bib6" ref-type="bibr">[6]</xref>. We summarize travel-related cases of MERS-CoV with focus on the epidemiology and prevention in travelers.</p></sec><sec id="sec2"><label>2</label><title>Source for human infection</title><p id="p0020">Patterns of transmission of MERS CoV remain unclear. Hypotheses include frequent zoonotic infections with limited subsequent human-to-human transmission chains with self-sustained epidemic in humans <xref rid="bib16" ref-type="bibr">[16]</xref>, <xref rid="bib11" ref-type="bibr">[11]</xref>. There is growing evidence that the dromedary camel is a reservoir for the MERS-CoV and is playing an important role in the transmission to humans <xref rid="bib15" ref-type="bibr">[15]</xref>, <xref rid="bib18" ref-type="bibr">[18]</xref>, <xref rid="bib19" ref-type="bibr">[19]</xref>. Although bats have been the ultimate progenitor virus, epidemiologically appears more likely that camels would be the source of infection in humans <xref rid="bib6" ref-type="bibr">[6]</xref>. The ways of human-to-human transmission include direct transmission through droplets produced during coughing or sneezing, indirect transmission through contact with contaminated surfaces and devices <xref rid="bib6" ref-type="bibr">[6]</xref>. A recent study showed that when MERS-CoV is added to unpasteurized camel milk stored at 4 °C, the virus remains infectious beyond 72 h but that infectious viruses could not be found after pasteurization <xref rid="bib7" ref-type="bibr">[7]</xref>.</p></sec><sec id="sec3"><label>3</label><title>Epidemiology and risk for travelers</title><p id="p0025">The number of reported cases of MERS-CoV increased markedly since mid March 2014. In particular, the number of cases reported in April 2014 account for more than 50% of the total cases which have been reported seen June 2012 <xref rid="bib5" ref-type="bibr">[5]</xref>. The travel-associated MERS-CoV cases reported by countries outside the Arabian Peninsula in 2014 occurred in persons with residence in or travel to countries of the Middle East. The first imported case in Greece <xref rid="bib11" ref-type="bibr">[11]</xref> increased to six the number European countries with confirmed cases of MERS-CoV infection amongst travelers, namely Germany, Greece, France, Italy, Netherlands and the United Kingdom (UK) <xref rid="bib6" ref-type="bibr">[6]</xref>. Furthermore, imported primary cases have been reported by other countries outside Europe such as Egypt, Tunisia, Malaysia and the Philippines (<xref rid="fig1" ref-type="fig">Fig. 1</xref>) <xref rid="bib6" ref-type="bibr">[6]</xref>. Characteristics of MERS-CoV infection cases in travelers are presented in <xref rid="tbl1" ref-type="table">Table 1</xref>. The majority of them were male (92.8%), and between 27 and 73 years of age, with a case fatality rate of 28.5%. Most common destination was Saudi Arabia (64.2%). Travel related cases have been associated with secondary cases in close contacts of index cases without a travel history suggesting person-to-person, although limited, transmission; a total of seven secondary cases have been reported in the literature <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib12" ref-type="bibr">[12]</xref>, <xref rid="bib13" ref-type="bibr">[13]</xref>, <xref rid="bib16" ref-type="bibr">[16]</xref>. Family clusters have been described in relation to the imported cases in Tunisia and the UK <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib16" ref-type="bibr">[16]</xref> as well as in health-care settings <xref rid="bib13" ref-type="bibr">[13]</xref>, <xref rid="bib17" ref-type="bibr">[17]</xref>, <xref rid="bib20" ref-type="bibr">[20]</xref>.<fig id="fig1"><label>Fig. 1</label><caption><p>Geographical distribution of travel-related MERS-CoV cases and places of probable infections worldwide, as of 28 of May (<italic>n</italic> = 14)*.</p></caption><graphic xlink:href="gr1_lrg"></graphic></fig><table-wrap position="float" id="tbl1"><label>Table 1</label><caption><p>Characteristics of published MERS (Co–V) cases among travelers.</p></caption><table frame="hsides" rules="groups"><thead><tr><th>Country of importation</th><th>Ref</th><th>Age</th><th>Gender</th><th>Destination</th><th>Duration of travel (days)</th><th>Purpose of travel</th><th>Past history</th><th>Animal contact</th><th>Laboratory confirmation</th><th>Outcome</th><th>Secondary cases</th></tr></thead><tbody><tr><td>1. Egypt</td><td align="char">16</td><td>27</td><td>M</td><td>SA</td><td>Expatriate</td><td>NA</td><td>NA</td><td>NA</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>2. France</td><td align="char">13</td><td>64</td><td>M</td><td>UAE</td><td>8</td><td>NA</td><td>Renal transplantation</td><td>NA</td><td>YES</td><td>Died</td><td align="char">1</td></tr><tr><td>3. Germany</td><td align="char">14</td><td>73</td><td>M</td><td>UAE</td><td>Local citizen</td><td>NA</td><td>Multiple Myeloma</td><td>YES<break></break>Camel Breeder</td><td>YES</td><td>Died</td><td>–</td></tr><tr><td>4. Germany</td><td align="char">15,22</td><td>∼49</td><td>M</td><td>Qatar</td><td>Local citizen</td><td>NA</td><td>Heavy Smoker</td><td>YES<break></break>Camel, goat</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>5. Greece</td><td align="char">11</td><td>69</td><td>M</td><td>SA</td><td>Expatriate</td><td>Work</td><td>NA</td><td>YES<break></break>Indirect with bats</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>6. Italy</td><td align="char">12</td><td>45</td><td>M</td><td>Jordan</td><td>40</td><td>Tourist</td><td>Nil</td><td>NA</td><td>YES</td><td>Survived</td><td align="char">2</td></tr><tr><td>7. Malaysia</td><td align="char">16</td><td>54</td><td>M</td><td>SA</td><td>13</td><td>Pilgrim</td><td>Underlying health conditions</td><td>YES</td><td>YES</td><td>Died</td><td>–</td></tr><tr><td>8. Netherlands</td><td align="char">16</td><td>70</td><td>M</td><td>SA</td><td>14</td><td>Pilgrim</td><td>NA</td><td>NO</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>9. Philippines</td><td align="char">16</td><td>34</td><td>F</td><td>UAE</td><td>Expatriate</td><td>Work</td><td>Nil</td><td>NA</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>10. Tunisia</td><td align="char">16</td><td>65</td><td>M</td><td>SA</td><td>NA</td><td>NA</td><td>NA</td><td>NA</td><td>YES</td><td>Died</td><td align="char">2</td></tr><tr><td>11. UK</td><td align="char">10</td><td>49</td><td>M</td><td>SA</td><td><30</td><td>Tourist</td><td>Nil</td><td>YES</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>12. UK</td><td align="char">9</td><td>middle aged</td><td>M</td><td>SA/Pakistan</td><td>8/35</td><td>Pilgrim</td><td>Nil</td><td>NO</td><td>YES</td><td>Survived</td><td align="char">2</td></tr><tr><td>13. USA</td><td align="char">17</td><td>≥60</td><td>M</td><td>SA</td><td>Expatriate</td><td>Work</td><td>NA</td><td>NA</td><td>YES</td><td>Survived</td><td>–</td></tr><tr><td>14. USA</td><td align="char">17</td><td>≥40</td><td>M</td><td>SA</td><td>Expatriate</td><td>Work</td><td>NA</td><td>NA</td><td>YES</td><td>Survived</td><td>–</td></tr></tbody></table><table-wrap-foot><fn><p>Abbreviations: UAE: United Arab Emirates, UK: United Kingdom, USA: United States America, SA: Saudi Arabia, NA: Not available.</p></fn></table-wrap-foot></table-wrap></p><p id="p0030">Work is one of the common reasons for travel to the Middle East. A recent Greek airport based survey which was conducted from 2011 to 2013 showed that 46.8% of business travelers who visited tropical and subtropical areas traveled to the Middle East <xref rid="bib21" ref-type="bibr">[21]</xref>. Many Middle Eastern countries are home to large foreign-born populations including migrant workers. Five of all MERS CoV cases amongst travelers concerned expatriates who resided in Saudi Arabia <xref rid="bib11" ref-type="bibr">[11]</xref>, <xref rid="bib16" ref-type="bibr">[16]</xref>, <xref rid="bib17" ref-type="bibr">[17]</xref>; three of them were health-care workers <xref rid="bib16" ref-type="bibr">[16]</xref>, <xref rid="bib17" ref-type="bibr">[17]</xref>; this highlights the importance of adherence to recommended infection-control measures, such as standard, contact, and airborne precautions (including eye protection), for health-care workers working in health care settings in the affected countries, while managing patients under investigation or who have probable or confirmed MERS-CoV infections <xref rid="bib16" ref-type="bibr">[16]</xref>. Contact with animals, in particular visiting, or working in a camel farm is considered a risk factor for acquiring the disease; the Malaysian pilgrim, the first UK and the two German imported cases reported contact with camels during their stay in the Arabian Peninsula (35.7% of all cases) <xref rid="bib10" ref-type="bibr">[10]</xref>, <xref rid="bib14" ref-type="bibr">[14]</xref>, <xref rid="bib22" ref-type="bibr">[22]</xref>. This information was not known in 50% of the cases (<xref rid="tbl1" ref-type="table">Table 1</xref>).</p><p id="p0035">Hajj, the largest religious mass gathering takes place every year in Saudi Arabia; it has become the epicenter of mass migration of millions of Muslims of large ethnic diversity. Communicable disease outbreaks of various infectious diseases have been reported repeatedly, during and following the Hajj <xref rid="bib23" ref-type="bibr">[23]</xref>. Several studies have been carried out for the surveillance of MERS-CoV in pilgrims <xref rid="bib24" ref-type="bibr">[24]</xref>, <xref rid="bib25" ref-type="bibr">[25]</xref>, <xref rid="bib26" ref-type="bibr">[26]</xref>, <xref rid="bib27" ref-type="bibr">[27]</xref>. A rapid acquisition of respiratory viruses, mainly rhinovirus was found in 39% of French pilgrims who suffered from respiratory symptoms soon after commencing the 2012 Hajj, with 11% returning infected to France with potential spreading of these respiratory viruses <xref rid="bib25" ref-type="bibr">[25]</xref>. No case of MERS-CoV nasal carriage was evidenced in this cohort, despite high rates of respiratory symptoms <xref rid="bib26" ref-type="bibr">[26]</xref>. Similarly, there was no evidence of MERS-CoV nasal carriage among Hajj pilgrims in another study which was performed on pilgrims from 22 countries attending the 2013 Hajj <xref rid="bib27" ref-type="bibr">[27]</xref>. This study revealed that rates of compulsory vaccinations uptake were high, whereas uptake of pneumococcal and flu seasonal vaccinations were low, including among the high-risk population showing pilgrims' poor compliance with vaccine recommendations <xref rid="bib27" ref-type="bibr">[27]</xref>; this may explain the increased prevalence of influenza in pilgrims <xref rid="bib28" ref-type="bibr">[28]</xref>. Although there was no evidence of MERS-CoV nasal carriage during screening of Hajj pilgrims, three of the cases amongst travelers concerned pilgrims returning from Mecca to the country where they reside (Malaysia, Netherlands and United Kingdom, respectively) <xref rid="bib9" ref-type="bibr">[9]</xref>, <xref rid="bib16" ref-type="bibr">[16]</xref>. The patient from Malaysia, a 54 year-old man with underlying health conditions traveled to Saudi Arabia with a pilgrimage group of 18 and visited a camel farm, during which he consumed camel milk. There was no human-to-human transmission observed amongst close contacts and in health-care facilities in Malaysia <xref rid="bib16" ref-type="bibr">[16]</xref>. The case from the Netherlands which concerned a 70 year old man reported no contact with animals or consumption of raw animal products. Identification of close contacts, including flight contacts was also initiated <xref rid="bib16" ref-type="bibr">[16]</xref>. Cluster cases were reported during contact tracing of the third case which concerned an adult middle-aged male in the United Kingdom who visited Mecca and Medina on pilgrimage. No direct contact with animals or with people with severe respiratory illness was reported in the 10 days before the onset of his illness. Contact tracing, including aircraft passengers identified two secondary cases among family members without a history recent travel: one developed a severe respiratory illness and died and the other influenza-like illness; no other severe cases were identified or CoV detected in respiratory samples among 135 contacts for the following 10 days <xref rid="bib9" ref-type="bibr">[9]</xref>.</p><p id="p0040">MERS-CoV has emerged in the Middle East where religious mass gatherings take place in Saudi Arabia every year and potentially may cause severe, life-threatening respiratory disease which may contribute to the international spread of MERS-CoV. Religious mass gatherings in Saudi Arabia draw millions of travelers and Muslim pilgrims from predominantly resource poor countries with limited medical and public health capacity for the detection and response to imported cases. This may lead to domestic transmission and the onset of an outbreak at <xref rid="bib29" ref-type="bibr">[29]</xref>. Based on the predicted population movements out of Saudi Arabia, a potential for a global spread of MERS-CoV can not be excluded according to Kahn and colleagues <xref rid="bib29" ref-type="bibr">[29]</xref>. Breban and colleagues calculated that the risk for MERS-CoV to have a pandemic potential is less than 5%; however the influence of Hajj mass gathering was not taken into account <xref rid="bib30" ref-type="bibr">[30]</xref>.</p><p id="p0045">According to a recent French study, despite the Saudi Arabia Ministry of Health recommendation for people at highest risk of the complications of MERS (Co–V) to refrain from the 2013 Hajj for their own safety, 48% of pilgrims preparing for Hajj from France did not comply <xref rid="bib31" ref-type="bibr">[31]</xref>, <xref rid="bib32" ref-type="bibr">[32]</xref>. Knowledge, attitudes and practices of Hajj pilgrims about MERS (Co–V) may be influenced by cultural and religious beliefs; although they may be aware about the Saudi Ministry of Health recommendations and may be informed about the risks during a pre-travel consultation there is a need for communication strategies for this high risk group of travelers in order to improve their risk perception and attitudes towards prevention <xref rid="bib33" ref-type="bibr">[33]</xref>.</p></sec><sec id="sec4"><label>4</label><title>Prevention of MERS-CoV in travelers</title><p id="p0050">The current epidemiology of MERS-CoV on the Arabian Peninsula may lead to travel implications and it is likely that more cases will be imported and detected globally <xref rid="bib34" ref-type="bibr">[34]</xref>. Furthermore, MERS CoV cases may be imported to other regions of the world by pilgrims who visit Saudi Arabia for Hajj and Umrah. WHO travel advice does not impose any travel or trade restrictions with regard to MERS-CoV and does not advise special screening at points of entry <xref rid="bib6" ref-type="bibr">[6]</xref>.</p><p id="p0055">Further vigilance in assessing patients with travel history to the affected region is warranted. Travel health consultants should have access to updated information in regards to the epidemiology of the disease and preventive measures and they could contribute to the surveillance of imported cases. Although the source of the virus and the mechanism of transmission is unknown, it would be important to take all possible preventive measures in order to reduce the general risk of infection while traveling <xref rid="bib5" ref-type="bibr">[5]</xref>, <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>. Thus Public Health Authorities should develop strategies in order to increase awareness about MERS (CoV) in travelers, health and tourism industry professionals.</p><p id="p0060">Non-pharmaceutical interventions are known to reduce the spread of respiratory viruses from person to person <xref rid="bib35" ref-type="bibr">[35]</xref>. Therefore, people visiting the Middle East at all times of the year and in particular pilgrims of Hajj and Umrah should take precautions such as: avoiding close contact with people suffering from acute respiratory infections, take personal hygiene measures (frequent hand-washing, cough and sneeze etiquette), adhering to food safety and hygiene rules (avoiding unsafe water, undercooked meats, raw fruits and vegetables unless they have been peeled). Raw camel milk consumption in the Middle East may be associated with several zoonotic infections; therefore it is advisable for Hajj pilgrims to avoid unpasteurized milk. It is also recommended to avoid close contact with live farm or wild animals in particular camels <xref rid="bib36" ref-type="bibr">[36]</xref>. Travelers to the Middle East who develop respiratory symptoms either during travel or within 14 days after their return should seek medical attention. A history about their recent trip should be given. Furthermore they should practice cough etiquette (cover coughs and sneezes with disposable tissues, maintain distance, and wash hands) and to postpone their travel until they are no longer symptomatic (<xref rid="tbl2" ref-type="table">Table 2</xref>) <xref rid="bib5" ref-type="bibr">[5]</xref>, <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>, <xref rid="bib37" ref-type="bibr">[37]</xref>, <xref rid="bib38" ref-type="bibr">[38]</xref>.<table-wrap position="float" id="tbl2"><label>Table 2</label><caption><p>MERS CoV preventive advice for travelers to the Middle East.<xref rid="tbl2fna" ref-type="table-fn">a</xref></p></caption><table frame="hsides" rules="groups"><tbody><tr><td><list list-type="simple" id="olist0010"><list-item id="o0010"><label>1.</label><p id="p0095">Wash your hands with soap and water or apply an alcohol solution.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0015"><list-item id="o0015"><label>2.</label><p id="p0100">Cover your mouth and nose with a tissue while coughing or sneezing.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0020"><list-item id="o0020"><label>3.</label><p id="p0105">Avoid hand shaking or touching your mouth, nose and eyes with your hands.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0025"><list-item id="o0025"><label>4.</label><p id="p0110">Avoid contact with patients with respiratory symptoms.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0030"><list-item id="o0030"><label>5.</label><p id="p0115">Avoid contact with domestic or wild animals (e.g. camels).</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0035"><list-item id="o0035"><label>6.</label><p id="p0120">Avoid contact with animal secretions (e.g. urine, faeces).</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0040"><list-item id="o0040"><label>7.</label><p id="p0125">Avoid consumption of unpasteurized milk (in particular from camels), or meat inadequately cooked.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0045"><list-item id="o0045"><label>8.</label><p id="p0130">Avoid consumption of fruit and vegetables which are not washed or peeled by yourself.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0050"><list-item id="o0050"><label>9.</label><p id="p0135">If you develop any respiratory symptoms during your trip seek medical attention immediately, report your recent trip and postpone your return until you have fully recovered.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0055"><list-item id="o0055"><label>10.</label><p id="p0140">After returning from countries of the Middle East, if within 14 days you develop fever 38 °C or more and respiratory symptoms (cough, shortness of breath, etc) you should seek medical attention immediately and inform your doctor about your recent trip.</p></list-item></list></td></tr><tr><td><list list-type="simple" id="olist0060"><list-item id="o0060"><label>11.</label><p id="p0145">If you are a pilgrim traveling for Hajj and Umrah and above 65 years of age, or if you suffer from chronic diseases (e.g. heart, kidney or respiratory disease, diabetes, congenital or acquired immune deficiency, malignancy or terminal illness, or if you are a pregnant women or a child (<12 years of age), you should postpone the performance of the Hajj and Umrah for your own safety<xref rid="tbl2fnb" ref-type="table-fn">b</xref></p></list-item></list></td></tr></tbody></table><table-wrap-foot><fn id="tbl2fna"><label>a</label><p id="ntpara0010">In accordance with WHO, CDC, ECDC and the Hellenic Centre for Disease Control and Prevention guidelines.</p></fn></table-wrap-foot><table-wrap-foot><fn id="tbl2fnb"><label>b</label><p id="ntpara0015">The Saudi Ministry of Health (MoH) recommendations.</p></fn></table-wrap-foot></table-wrap></p><p id="p0065">Based on current information, it is prudent for people at high risk for severe disease due to MERS-CoV (e.g. those with diabetes, immunosuppression, chronic lung disease, pre-existing renal failure) to take appropriate precautions when visiting farms, barn areas or market environments where camels are present such as avoiding contact with camels, personal hygiene measures, and avoiding drinking raw milk or eating food that may be contaminated with animal secretions or products unless they are properly washed, peeled, or cooked <xref rid="bib5" ref-type="bibr">[5]</xref>, <xref rid="bib6" ref-type="bibr">[6]</xref>, <xref rid="bib7" ref-type="bibr">[7]</xref>, <xref rid="bib37" ref-type="bibr">[37]</xref>, <xref rid="bib38" ref-type="bibr">[38]</xref>.</p><p id="p0070">The Saudi Ministry of Health (MoH) recommendations include that elderly people, above 65 years of age, and those with chronic diseases e.g. heart disease, kidney disease, respiratory disease and diabetes and pilgrims with immune deficiency such as congenital and acquired, malignancies and terminal illnesses, pregnant women and children (under 12) coming for Hajj and Umrah, should postpone the performance of the Hajj and Umrah for their own safety <xref rid="bib31" ref-type="bibr">[31]</xref>.</p></sec><sec id="sec5"><label>5</label><title>Conclusion</title><p id="p0075">MERS-CoV infection is an emerging disease with pandemic potential originating from Saudi Arabia, where millions of pilgrims travel for two mass gatherings annually. The majority of MERS-CoV cases are reported in Saudi Arabia with a significant rate of hospital transmission. The possibility of airborne transmission is very low and secondary cases are only likely after close contact and due to severe symptoms there is only little likelihood of unregistered clinical cases. Countries should focus on increasing awareness of travelers visiting friends and relatives and of health professionals about patients with severe respiratory symptoms who report a recent history of travel to the region affected with MERS-CoV. Travel medicine practitioners should not discourage travelers to visit these countries as long as they follow the basic hygienic measures. Travelers should be advised to avoid local hospitals if medical help is needed and to be visited by a doctor instead. Measures should be taken by local health authorities of the affected countries in order to improve hospital hygiene. In addition, it is crucial to investigate the reasons for travelers' poor compliance with rules and recommendations issued by Saudi officials and to take appropriate measures in order to improve them.</p><p id="p0080">An internationally coordinated effort to better understand global population movements in this area and the most probable pathways for international spread of MERS-CoV could help direct anticipatory MERS-CoV surveillance and public health preparedness to mitigate its potential global health and economic impacts.</p></sec><sec id="sec6"><title>Conflict of interest</title><p id="p0085">None.</p></sec></body><back><ref-list id="cebib0010"><title>References</title><ref id="bib1"><label>1</label><mixed-citation publication-type="other" id="oref1">World Tourism Organization. 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