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The annual Hajj pilgrimage—minimizing the risk of ill health in pilgrims from Europe and opportunity for driving the best prevention and health promotion guidelines

Identifieur interne : 000D50 ( Pmc/Corpus ); précédent : 000D49; suivant : 000D51

The annual Hajj pilgrimage—minimizing the risk of ill health in pilgrims from Europe and opportunity for driving the best prevention and health promotion guidelines

Auteurs : Shuja Shafi ; Osman Dar ; Mishal Khan ; Minal Khan ; Esam I. Azhar ; Brian Mccloskey ; Alimuddin Zumla ; Eskild Petersen

Source :

RBID : PMC:7110525

Abstract

Highlights

Every year, the Kingdom of Saudi Arabia (KSA) hosts the Hajj pilgrimage, which is the largest mass gathering in the world held on a recurrent annual basis.

Infectious disease outbreaks at the annual Hajj pilgrimage are uncommon and have been controlled to a great extent.

Crush injuries and stampedes, which can pose major risks at mass gatherings, are infrequent during the Hajj relative to its size and logistical complexity.

The KSA runs a well-coordinated, inter-sectoral approach for the planning, communication, public health, and safety issues regarding the Hajj. Planning for Hajj starts soon after the end of the current Hajj and the KSA Ministry of Hajj and Ministry of Health liaise with governments of all countries from which pilgrims come to the KSA.

The KSA also provides regular updated Hajj travel advice and liaises closely with international public health organizations and Hajj travel agencies.

Recent alerts were raised for the prevailing global threats from Middle East respiratory syndrome coronavirus (MERS-CoV), Ebola, influenza and other respiratory tract viruses, multidrug-resistant TB, and multi-antibiotic-resistant bacteria.

The value of the Hajj experience to planners of mass gatherings in sharing best practices is evident, but lessons can go beyond mass gatherings to inform other areas of public health that require inter-sectoral engagement, such as One Health and the control of antimicrobial resistance.


Url:
DOI: 10.1016/j.ijid.2016.06.013
PubMed: 27343984
PubMed Central: 7110525

Links to Exploration step

PMC:7110525

Le document en format XML

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<p id="par0020">The KSA runs a well-coordinated, inter-sectoral approach for the planning, communication, public health, and safety issues regarding the Hajj. Planning for Hajj starts soon after the end of the current Hajj and the KSA Ministry of Hajj and Ministry of Health liaise with governments of all countries from which pilgrims come to the KSA.</p>
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<p id="par0030">Recent alerts were raised for the prevailing global threats from Middle East respiratory syndrome coronavirus (MERS-CoV), Ebola, influenza and other respiratory tract viruses, multidrug-resistant TB, and multi-antibiotic-resistant bacteria.</p>
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<p id="par0035">The value of the Hajj experience to planners of mass gatherings in sharing best practices is evident, but lessons can go beyond mass gatherings to inform other areas of public health that require inter-sectoral engagement, such as One Health and the control of antimicrobial resistance.</p>
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</TEI>
<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Int J Infect Dis</journal-id>
<journal-id journal-id-type="iso-abbrev">Int. J. Infect. Dis</journal-id>
<journal-title-group>
<journal-title>International Journal of Infectious Diseases</journal-title>
</journal-title-group>
<issn pub-type="ppub">1201-9712</issn>
<issn pub-type="epub">1878-3511</issn>
<publisher>
<publisher-name>Published by Elsevier Ltd on behalf of International Society for Infectious Diseases.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">27343984</article-id>
<article-id pub-id-type="pmc">7110525</article-id>
<article-id pub-id-type="publisher-id">S1201-9712(16)31097-9</article-id>
<article-id pub-id-type="doi">10.1016/j.ijid.2016.06.013</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Article</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>The annual Hajj pilgrimage—minimizing the risk of ill health in pilgrims from Europe and opportunity for driving the best prevention and health promotion guidelines</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author" id="aut0005">
<name>
<surname>Shafi</surname>
<given-names>Shuja</given-names>
</name>
<email>msshafi12@gmail.com</email>
<xref rid="aff0005" ref-type="aff">a</xref>
<xref rid="cor0005" ref-type="corresp"></xref>
</contrib>
<contrib contrib-type="author" id="aut0010">
<name>
<surname>Dar</surname>
<given-names>Osman</given-names>
</name>
<xref rid="aff0010" ref-type="aff">b</xref>
<xref rid="aff0015" ref-type="aff">c</xref>
</contrib>
<contrib contrib-type="author" id="aut0015">
<name>
<surname>Khan</surname>
<given-names>Mishal</given-names>
</name>
<xref rid="aff0020" ref-type="aff">d</xref>
<xref rid="aff0025" ref-type="aff">e</xref>
</contrib>
<contrib contrib-type="author" id="aut0020">
<name>
<surname>Khan</surname>
<given-names>Minal</given-names>
</name>
<xref rid="aff0030" ref-type="aff">f</xref>
</contrib>
<contrib contrib-type="author" id="aut0025">
<name>
<surname>Azhar</surname>
<given-names>Esam I.</given-names>
</name>
<xref rid="aff0035" ref-type="aff">g</xref>
</contrib>
<contrib contrib-type="author" id="aut0030">
<name>
<surname>McCloskey</surname>
<given-names>Brian</given-names>
</name>
<xref rid="aff0040" ref-type="aff">h</xref>
</contrib>
<contrib contrib-type="author" id="aut0035">
<name>
<surname>Zumla</surname>
<given-names>Alimuddin</given-names>
</name>
<xref rid="aff0045" ref-type="aff">i</xref>
</contrib>
<contrib contrib-type="author" id="aut0040">
<name>
<surname>Petersen</surname>
<given-names>Eskild</given-names>
</name>
<xref rid="aff0050" ref-type="aff">j</xref>
<xref rid="aff0055" ref-type="aff">k</xref>
</contrib>
</contrib-group>
<aff id="aff0005">
<label>a</label>
Muslim Council of Great Britain, London, UK</aff>
<aff id="aff0010">
<label>b</label>
Public Health England, London, UK</aff>
<aff id="aff0015">
<label>c</label>
Chatham House Centre on Global Health Security, Royal Institute of International Affairs, London, UK</aff>
<aff id="aff0020">
<label>d</label>
London School of Hygiene and Tropical Medicine, London, UK</aff>
<aff id="aff0025">
<label>e</label>
Saw Swee Hock School of Public Health, National University of Singapore, Singapore</aff>
<aff id="aff0030">
<label>f</label>
Imperial College London, London, UK</aff>
<aff id="aff0035">
<label>g</label>
Special Infectious Agents Unit, King Fahd Medical Research Centre, and Medical Laboratory Technology Department, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia</aff>
<aff id="aff0040">
<label>h</label>
Global Health Department, Public Health England, London, UK</aff>
<aff id="aff0045">
<label>i</label>
Division of Infection and Immunity, University College London, and NIHR Biomedical Research Centre, UCL Hospitals NHS Foundation Trust, London, UK</aff>
<aff id="aff0050">
<label>j</label>
Institute of Clinical Medicine, University of Aarhus, Denmark</aff>
<aff id="aff0055">
<label>k</label>
The Royal Hospital, Muscat, Oman</aff>
<author-notes>
<corresp id="cor0005">
<label></label>
Corresponding author.
<email>msshafi12@gmail.com</email>
</corresp>
</author-notes>
<pub-date pub-type="pmc-release">
<day>22</day>
<month>6</month>
<year>2016</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">
<month>6</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>22</day>
<month>6</month>
<year>2016</year>
</pub-date>
<volume>47</volume>
<fpage>79</fpage>
<lpage>82</lpage>
<history>
<date date-type="received">
<day>8</day>
<month>6</month>
<year>2016</year>
</date>
<date date-type="accepted">
<day>8</day>
<month>6</month>
<year>2016</year>
</date>
</history>
<permissions>
<copyright-statement>© 2016 Published by Elsevier Ltd on behalf of International Society for Infectious Diseases.</copyright-statement>
<copyright-year>2016</copyright-year>
<copyright-holder></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 abstract-type="author-highlights" id="abs0005">
<title>Highlights</title>
<p>
<list list-type="simple" id="lis0005">
<list-item id="lsti0005">
<label></label>
<p id="par0005">Every year, the Kingdom of Saudi Arabia (KSA) hosts the Hajj pilgrimage, which is the largest mass gathering in the world held on a recurrent annual basis.</p>
</list-item>
<list-item id="lsti0010">
<label></label>
<p id="par0010">Infectious disease outbreaks at the annual Hajj pilgrimage are uncommon and have been controlled to a great extent.</p>
</list-item>
<list-item id="lsti0015">
<label></label>
<p id="par0015">Crush injuries and stampedes, which can pose major risks at mass gatherings, are infrequent during the Hajj relative to its size and logistical complexity.</p>
</list-item>
<list-item id="lsti0020">
<label></label>
<p id="par0020">The KSA runs a well-coordinated, inter-sectoral approach for the planning, communication, public health, and safety issues regarding the Hajj. Planning for Hajj starts soon after the end of the current Hajj and the KSA Ministry of Hajj and Ministry of Health liaise with governments of all countries from which pilgrims come to the KSA.</p>
</list-item>
<list-item id="lsti0025">
<label></label>
<p id="par0025">The KSA also provides regular updated Hajj travel advice and liaises closely with international public health organizations and Hajj travel agencies.</p>
</list-item>
<list-item id="lsti0030">
<label></label>
<p id="par0030">Recent alerts were raised for the prevailing global threats from Middle East respiratory syndrome coronavirus (MERS-CoV), Ebola, influenza and other respiratory tract viruses, multidrug-resistant TB, and multi-antibiotic-resistant bacteria.</p>
</list-item>
<list-item id="lsti0035">
<label></label>
<p id="par0035">The value of the Hajj experience to planners of mass gatherings in sharing best practices is evident, but lessons can go beyond mass gatherings to inform other areas of public health that require inter-sectoral engagement, such as One Health and the control of antimicrobial resistance.</p>
</list-item>
</list>
</p>
</abstract>
<abstract id="abs0010">
<title>Summary</title>
<p>Mass gatherings at religious events can pose major public health challenges, particularly the transmission of infectious diseases. Every year the Kingdom of Saudi Arabia (KSA) hosts the Hajj pilgrimage, the largest gathering held on an annual basis where over 2 million people come to KSA from over 180 countries. Living together in crowded conditions exposes the pilgrims and the local population to a range infectious diseases. Respiratory and gastrointestinal tract bacterial and viral infections can spread rapidly and affect attendees of mass gatherings. Lethal infectious disease outbreaks were common during Hajj in the 19th and 20th centuries although they have now been controlled to a great extent by the huge investments made by the KSA into public health prevention and surveillance programs. The KSA provides regular updated Hajj travel advice and health regulations through international public health agencies such as the WHO, Public Health England, the Centers for Disease Control and Prevention, and Hajj travel agencies. During the Hajj, an additional 25 000 health workers are deployed; there are eight hospitals in Makkah and Mina complete with state-of-the-art surgical wards and intensive care units made specifically available for pilgrims. All medical facilities offer high quality of care, and services are offered free to Hajj pilgrims to ensure the risks of ill health to all pilgrims and KSA residents are minimal. A summary of the key health issues that arise in pilgrims from Europe during Hajj and of the KSA Hajj guidelines, together with other factors that may play a role in reducing the risks to pilgrims and to wider global health security, is provided herein.</p>
</abstract>
<kwd-group id="kwd0005">
<title>Keywords</title>
<kwd>Mass agthering</kwd>
<kwd>Hajj</kwd>
<kwd>public health</kwd>
<kwd>prevention</kwd>
</kwd-group>
</article-meta>
</front>
<body>
<sec id="sec0005">
<label>1</label>
<title>Introduction</title>
<p id="par0040">Mass gathering sporting and religious events pose important public health challenges, including the transmission of infectious diseases, exacerbation of non-communicable diseases, and disorders related to climate change.
<xref rid="bib0005" ref-type="bibr">1</xref>
,
<xref rid="bib0010" ref-type="bibr">2</xref>
,
<xref rid="bib0015" ref-type="bibr">3</xref>
,
<xref rid="bib0020" ref-type="bibr">4</xref>
,
<xref rid="bib0025" ref-type="bibr">5</xref>
Every year, the Kingdom of Saudi Arabia (KSA) hosts the Hajj pilgrimage, which is the largest mass gathering in the world held on a recurrent annual basis.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
The Hajj occurs annually from the eighth to the 12
<sup>th</sup>
of Dhul al-Hijah, the last (12
<sup>th</sup>
) month of the Islamic calendar, and two to three million people perform the pilgrimage during this period.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
A further seven million complete a ‘mini’ pilgrimage, known as Umrah, outside the Hajj period throughout the year.</p>
<p id="par0045">In light of the huge number of pilgrims from all around the world – of which thousands come from low-income countries with minimal access to healthcare – mixing closely for several days in a difficult terrain, it is remarkable that the majority of pilgrims complete the Hajj without experiencing any major health issues. Infectious disease outbreaks were common during Hajj in the 19
<sup>th</sup>
and 20
<sup>th</sup>
centuries and have been controlled to a great extent, although proactive surveillance of the transmission of potential epidemic threats at Hajj is critical to preserving global health security.
<xref rid="bib0015" ref-type="bibr">3</xref>
,
<xref rid="bib0025" ref-type="bibr">5</xref>
Crush injuries and stampedes, which can pose major risks at mass gatherings, are infrequent during the Hajj relative to its size and logistical complexity. A summary of the key health issues that arise in pilgrims from Europe during Hajj and of the KSA Hajj guidelines, together with other factors that may play a role in reducing the risks to pilgrims and to wider global health security, is provided herein.</p>
</sec>
<sec id="sec0010">
<label>2</label>
<title>Health risks during the Hajj</title>
<sec id="sec0015">
<label>2.1</label>
<title>Communicable diseases</title>
<p id="par0050">Respiratory and gastrointestinal tract bacterial and viral infections spread rapidly and affect almost all pilgrims during Hajj.
<xref rid="bib0030" ref-type="bibr">6</xref>
,
<xref rid="bib0035" ref-type="bibr">7</xref>
,
<xref rid="bib0040" ref-type="bibr">8</xref>
,
<xref rid="bib0045" ref-type="bibr">9</xref>
,
<xref rid="bib0050" ref-type="bibr">10</xref>
,
<xref rid="bib0055" ref-type="bibr">11</xref>
,
<xref rid="bib0060" ref-type="bibr">12</xref>
,
<xref rid="bib0065" ref-type="bibr">13</xref>
Respiratory tract infections – whose spread through coughing and sneezing is exacerbated by the crowded Hajj conditions – include community-acquired pneumonia, influenza, and tuberculosis (TB). While bacterial and viral pneumonia are well-documented causes of hospital admission in pilgrims,
<xref rid="bib0065" ref-type="bibr">
<sup>13</sup>
</xref>
quantifying the increase in risk of TB transmission is more challenging owing to the longer time period between infection and the development of symptoms. The elderly and those with comorbid diseases such as diabetes are particularly vulnerable to morbidity from respiratory illnesses.</p>
</sec>
<sec id="sec0020">
<label>2.2</label>
<title>Gastrointestinal disorders</title>
<p id="par0055">Acute food poisoning is common during the Hajj and is caused by toxins produced by
<italic>Staphylococcus aureus</italic>
and
<italic>Bacillus cereus</italic>
. Gastroenteritis due to
<italic>Salmonella spp</italic>
and viruses such as rotavirus and norovirus are common during Hajj.
<xref rid="bib0015" ref-type="bibr">3</xref>
,
<xref rid="bib0060" ref-type="bibr">12</xref>
Factors responsible for increasing the spread of gastrointestinal diseases during Hajj include contamination of food through unhygienic preparation, prolonged storage of food, drinking from contaminated water sources, and a shortage of water for hand washing. The risks of dehydration are heightened when Hajj occurs during summer months, owing to the extremely hot climate in Saudi Arabia.
<xref rid="bib0070" ref-type="bibr">
<sup>14</sup>
</xref>
</p>
<p id="par0060">Other infectious disease risks include meningococcal disease, which caused outbreaks during Hajj in the early 2000s owing to overcrowding and high carrier rates of 
<italic>Neisseria meningitidis</italic>
 among pilgrims.
<xref rid="bib0015" ref-type="bibr">3</xref>
,
<xref rid="bib0075" ref-type="bibr">15</xref>
,
<xref rid="bib0080" ref-type="bibr">16</xref>
,
<xref rid="bib0085" ref-type="bibr">17</xref>
Mosquito species responsible for the transmission of malaria and the arbovirus that causes dengue are present in the KSA, although the country has been classified by the World Health Organization (WHO) as a low, geographically restricted malaria transmission area since 2008.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
</p>
</sec>
<sec id="sec0025">
<label>2.3</label>
<title>Non-communicable diseases</title>
<p id="par0065">Historically, infectious diseases were the largest cause of morbidity and mortality during Hajj, but non-communicable diseases are now a major burden.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
Many pilgrims both elderly and young have existing non-communicable diseases such as diabetes, hypertension, arthritis, epilepsy, liver and kidney disease, which can be worsened by strenuous Hajj conditions or if regular medications are neglected during the spiritual activities. In addition to cardiovascular disease, heat exhaustion and heatstroke are important causes of death; again health-related morbidity is exacerbated when Hajj occurs during the summer months.</p>
</sec>
<sec id="sec0030">
<label>2.4</label>
<title>Fire and trauma</title>
<p id="par0070">The risk of injury from fires has been reduced since tents were replaced with fibreglass and cooking in tents was prohibited following a fire in 1997. However, risks from stampedes and crush injuries remain due to the overcrowding. As the events of the falling cranes and the stampede in the 2015 Hajj illustrate, trauma can be a major cause of injury and death during Hajj. Furthermore, many pilgrims who walk long distances as part of the rituals invariably are injured by motor vehicles.</p>
</sec>
</sec>
<sec id="sec0035">
<label>3</label>
<title>Factors reducing health risks (
<xref rid="tbl0005" ref-type="table">Table 1</xref>
)</title>
<p id="par0075">
<xref rid="tbl0005" ref-type="table">Table 1</xref>
<table-wrap position="float" id="tbl0005">
<label>Table 1</label>
<caption>
<p>Factors contributing to reducing the health risks from Hajj</p>
</caption>
<alt-text id="at1">Table 1</alt-text>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th></th>
<th align="left">Hajj preparation activities, guidelines, and recommendations</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left">Hajj norms and rules</td>
<td align="left">The elderly, sick, and disabled are exempted from the obligation of performing Hajj
<break></break>
Crime is strictly forbidden during the pilgrimage, reducing the risk of violent altercations
<break></break>
The environment is weapon-free, drug-free, and alcohol-free
<break></break>
Tobacco intake is banned, curtailing the risk of inadvertent fire hazards
<break></break>
Sexual relations are not allowed, and male and female pilgrims are accommodated separately</td>
</tr>
<tr>
<td align="left">Extensive pre-Hajj activities undertaken by the KSA</td>
<td align="left">The Ministry of Health liaises closely with the KSA Ministry of Hajj to ensure entry requirements and Hajj health regulations are fulfilled
<break></break>
Extensive preparations by the KSA include lessons learned from the previous Hajj; preparations for the Hajj start as soon as possible after Hajj
<break></break>
Sophisticated command and control centre in place
<break></break>
Free healthcare through numerous hospitals and clinics at all points of the Hajj ritual journeys
<break></break>
The KSA Ministry of Health liaises with and updates all international public health agencies including the WHO, Public Health England, ECDC, and CDC
<break></break>
Close collaboration with relevant stakeholders (travel agents, Muslim councils, and tour organizers) in the countries where the pilgrims come from to develop appropriate material for health education
<break></break>
Issuing of vaccination and other health precautions guidelines well before the Hajj and vaccination certificates required prior to visa approval
<break></break>
Border controls to ensure fresh or unprocessed food is not imported by pilgrims</td>
</tr>
<tr>
<td align="left">KSA Hajj activities</td>
<td align="left">Ministry of Hajj, Ministry of Public Health, and the Ministry of Agriculture coordinate regular pesticide spraying
<break></break>
An additional 25 000 health workers are deployed specifically for pilgrims
<break></break>
Public health teams stationed through the Hajj site supervise key public health and preventive matters
<break></break>
Screening at port of entry for vaccinations; arrangements for one dose of oral polio vaccine for travellers arriving from polio-endemic countries and children under 15 years
<break></break>
Proactive command and control centre for Hajj
<break></break>
Use of the electronic health surveillance systems</td>
</tr>
<tr>
<td align="left">Areas under development</td>
<td align="left">Strategies to encourage personal hygiene behaviour (beyond educational messaging) for pilgrims and those handling food
<break></break>
Improving guidelines for non-communicable disease control (existing guidelines focus on communicable disease control)</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn>
<p>KSA, Kingdom of Saudi Arabia; WHO, World Health Organization; ECDC, European Centre for Disease Prevention and Control; CDC, US Centers for Disease Control and Prevention.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</p>
<sec id="sec0040">
<label>3.1</label>
<title>Pre-Hajj preparations</title>
<p id="par0080">The KSA Government employs a well-coordinated, inter-sectoral approach to the planning, communication, public health, and safety issues of the Hajj.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
Planning for Hajj starts soon after the end of the current Hajj and the KSA Ministry of Hajj and Ministry of Health liaise with the governments of all countries from which pilgrims come to the KSA. Recommendations discussed are pre-travel health regulations and advice about vaccinations, health checks, and specific immunizations at the port of entry. Well before each Hajj, the Saudi Ministry of Health generates the health requirements for the issue of travel visas. It also provides health education campaigns through the provision of reading materials and through travel agents, pilgrim group leaders, websites, and the media, both before and during the Hajj.</p>
<p id="par0085">The KSA Government also provides regular updated Hajj travel advice and health regulations through international public health agencies such as the WHO, Public Health England, the Centers for Disease Control and Prevention (CDC), and Hajj travel agencies. For the 2015 Hajj, for example, alerts were raised for the prevailing global threats from Middle East respiratory syndrome coronavirus (MERS-CoV), influenza and other respiratory tract viruses, multidrug-resistant TB, multi-antibiotic-resistant bacteria, and Ebola.
<xref rid="bib0090" ref-type="bibr">18</xref>
,
<xref rid="bib0095" ref-type="bibr">19</xref>
,
<xref rid="bib0100" ref-type="bibr">20</xref>
,
<xref rid="bib0105" ref-type="bibr">21</xref>
,
<xref rid="bib0030" ref-type="bibr">6</xref>
,
<xref rid="bib0110" ref-type="bibr">22</xref>
,
<xref rid="bib0115" ref-type="bibr">23</xref>
</p>
</sec>
<sec id="sec0045">
<label>3.2</label>
<title>Measures taken during Hajj</title>
<p id="par0090">During the Hajj, an additional 25 000 health workers are deployed; there are eight hospitals in Makkah and Mina complete with state-of-the-art surgical wards and intensive care units made specifically available for pilgrims.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
All medical facilities offer high quality of care, and services are offered free to Hajj pilgrims to ensure the risks of ill health to all pilgrims and KSA residents are minimal.</p>
<p id="par0095">In terms of preventative measures, in addition to the vaccination requirements described below, measures are put in place to ensure food safety and the Ministry of Health ensures strict enforcement of the regulation that pilgrims are not allowed to bring fresh food or agricultural products into the country. Other coordinated activities include targeted insecticide spraying to control mosquito populations, the distribution of health promotion materials to pilgrims, and electronic surveillance of infectious diseases.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
</p>
</sec>
<sec id="sec0050">
<label>3.3</label>
<title>Hajj regulations for incoming pilgrims</title>
<p id="par0100">The health requirements for pilgrimage to Mecca (Hajj and Umrah) are published annually by the KSA Government. Information for pilgrims is made available on the Saudi Arabia Ministry of Health website.
<xref rid="bib0120" ref-type="bibr">24</xref>
,
<xref rid="bib0125" ref-type="bibr">25</xref>
,
<xref rid="bib0130" ref-type="bibr">26</xref>
</p>
<p id="par0105">Meningococcal vaccine is a prerequisite for all pilgrims; Hajj visas cannot be issued without proof of meningococcal vaccination. All adults and children aged >2 years must have received a single dose of quadrivalent A/C/Y/W-135 vaccine and must show proof of vaccination on a valid International Certificate of Vaccination or Prophylaxis. Children between 3 months and 2 years of age must show proof of vaccination with two doses of meningococcal A monovalent vaccine with a 3-month interval between the doses. Hajj pilgrims need to have had the meningococcal vaccine ≤3 years and ≥10 days before arriving in Saudi Arabia.</p>
<p id="par0110">Other vaccination requirements for Hajj pilgrims entering from specific countries include yellow fever and polio vaccines. The yellow fever vaccine is mandatory for all travellers arriving from countries listed by the WHO as being a yellow fever risk. Polio vaccine is required for travellers arriving from countries that have polio virus circulating, or from countries at high risk of re-importation of polio virus, regardless of age and vaccination status. Those who do not have evidence certificates are immunized at the port of entry.
<xref rid="bib0015" ref-type="bibr">
<sup>3</sup>
</xref>
The Saudi Ministry of Health recommends seasonal influenza vaccine for those at increased risk, such as the elderly and those with chronic comorbidities.
<xref rid="bib0120" ref-type="bibr">
<sup>24</sup>
</xref>
However, there is conflicting evidence about the efficacy of influenza vaccine in protecting Hajj pilgrims.
<xref rid="bib0135" ref-type="bibr">27</xref>
,
<xref rid="bib0140" ref-type="bibr">28</xref>
Pneumonia is among the most common causes of hospital admission during Hajj,
<xref rid="bib0070" ref-type="bibr">
<sup>14</sup>
</xref>
and thus the prevention of pneumococcal infection is crucial. Pneumococcal polysaccharide vaccine is recommended for pilgrims aged ≥65 years and for younger pilgrims with comorbidities.
<xref rid="bib0145" ref-type="bibr">
<sup>29</sup>
</xref>
Finally, with regard to measles and rubella vaccines, updating immunization against vaccine-preventable diseases in all travellers is strongly recommended.</p>
</sec>
</sec>
<sec id="sec0055">
<label>4</label>
<title>Lessons for and beyond mass gatherings</title>
<p id="par0115">The prevention and management of threats to global health security and protecting the health and lives of pilgrims requires effective cooperation between numerous agencies within and outside the KSA.
<xref rid="bib0150" ref-type="bibr">
<sup>30</sup>
</xref>
The Hajj can therefore provide important lessons for setting up and maintaining inter-sectoral collaborations, for example between agencies responsible for health, transport, border control, and environmental health. The value of the Hajj experience to planners of mass gatherings in sharing best practices is evident, but lessons can go beyond mass gatherings to inform other areas of public health that require inter-sectoral engagement, such as One Health and the control of antimicrobial resistance. The Hajj also provides an opportunity for research, not only into all aspects of mass gatherings, but also into faith-based health promotion and electronic disease surveillance capacity building.</p>
<p id="par0120">
<italic>Conflict of interest:</italic>
All authors have an interest in infectious diseases transmission at mass gatherings.</p>
</sec>
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