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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Macrolides in critically ill patients with Middle East Respiratory Syndrome</title>
<author><name sortKey="Arabi, Yaseen M" sort="Arabi, Yaseen M" uniqKey="Arabi Y" first="Yaseen M." last="Arabi">Yaseen M. Arabi</name>
<affiliation><nlm:aff id="aff0005">College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0010">Intensive Care Department, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Deeb, Ahmad M" sort="Deeb, Ahmad M" uniqKey="Deeb A" first="Ahmad M." last="Deeb">Ahmad M. Deeb</name>
<affiliation><nlm:aff id="aff0015">Research Office, King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Ministry of the National Guard − Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Hameed, Fahad" sort="Al Hameed, Fahad" uniqKey="Al Hameed F" first="Fahad" last="Al-Hameed">Fahad Al-Hameed</name>
<affiliation><nlm:aff id="aff0020">College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0025">Department of Intensive Care, Ministry of the National Guard − Health Affairs, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mandourah, Yasser" sort="Mandourah, Yasser" uniqKey="Mandourah Y" first="Yasser" last="Mandourah">Yasser Mandourah</name>
<affiliation><nlm:aff id="aff0030">Department of Intensive Care Services, Prince Sultan Military Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Almekhlafi, Ghaleb A" sort="Almekhlafi, Ghaleb A" uniqKey="Almekhlafi G" first="Ghaleb A." last="Almekhlafi">Ghaleb A. Almekhlafi</name>
<affiliation><nlm:aff id="aff0030">Department of Intensive Care Services, Prince Sultan Military Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Sindi, Anees A" sort="Sindi, Anees A" uniqKey="Sindi A" first="Anees A." last="Sindi">Anees A. Sindi</name>
<affiliation><nlm:aff id="aff0035">Department of Anesthesia and Critical Care, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Omari, Awad" sort="Al Omari, Awad" uniqKey="Al Omari A" first="Awad" last="Al-Omari">Awad Al-Omari</name>
<affiliation><nlm:aff id="aff0040">College of Medicine, Alfaisal University, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0045">Department of Intensive Care, Dr Sulaiman Al-Habib Group Hospitals, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Shalhoub, Sarah" sort="Shalhoub, Sarah" uniqKey="Shalhoub S" first="Sarah" last="Shalhoub">Sarah Shalhoub</name>
<affiliation><nlm:aff id="aff0050">Department of Medicine, Division of Infectious Diseases, King Fahad Armed Forces Hospital, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0145">Department of Medicine, Division of Infectious Diseases, University of Western Ontario, London, Canada</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mady, Ahmed" sort="Mady, Ahmed" uniqKey="Mady A" first="Ahmed" last="Mady">Ahmed Mady</name>
<affiliation><nlm:aff id="aff0055">Intensive Care Department, King Saud Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0060">Department of Anesthesiology and Intensive Care, Tanta University Hospitals, Tanta, Egypt</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Alraddadi, Basem" sort="Alraddadi, Basem" uniqKey="Alraddadi B" first="Basem" last="Alraddadi">Basem Alraddadi</name>
<affiliation><nlm:aff id="aff0040">College of Medicine, Alfaisal University, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0065">Department of Medicine, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Almotairi, Abdullah" sort="Almotairi, Abdullah" uniqKey="Almotairi A" first="Abdullah" last="Almotairi">Abdullah Almotairi</name>
<affiliation><nlm:aff id="aff0070">Department of Critical Care Medicine, King Fahad Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Khatib, Kasim" sort="Al Khatib, Kasim" uniqKey="Al Khatib K" first="Kasim" last="Al Khatib">Kasim Al Khatib</name>
<affiliation><nlm:aff id="aff0075">Intensive Care Department, Al-Noor Specialist Hospital, Makkah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Abdulmomen, Ahmed" sort="Abdulmomen, Ahmed" uniqKey="Abdulmomen A" first="Ahmed" last="Abdulmomen">Ahmed Abdulmomen</name>
<affiliation><nlm:aff id="aff0080">Department of Critical Care Medicine, King Saud University, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Qushmaq, Ismael" sort="Qushmaq, Ismael" uniqKey="Qushmaq I" first="Ismael" last="Qushmaq">Ismael Qushmaq</name>
<affiliation><nlm:aff id="aff0065">Department of Medicine, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Solaiman, Othman" sort="Solaiman, Othman" uniqKey="Solaiman O" first="Othman" last="Solaiman">Othman Solaiman</name>
<affiliation><nlm:aff id="aff0085">King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Aithan, Abdulsalam M" sort="Al Aithan, Abdulsalam M" uniqKey="Al Aithan A" first="Abdulsalam M." last="Al-Aithan">Abdulsalam M. Al-Aithan</name>
<affiliation><nlm:aff id="aff0090">Intensive Care Department, Ministry of the National Guard - Health Affairs, Al Ahsa, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0150">King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Al Ahsa, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Raddadi, Rajaa" sort="Al Raddadi, Rajaa" uniqKey="Al Raddadi R" first="Rajaa" last="Al-Raddadi">Rajaa Al-Raddadi</name>
<affiliation><nlm:aff id="aff0095">King Abdulaziz University, Department of Family and Community Medicine, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ragab, Ahmad" sort="Ragab, Ahmad" uniqKey="Ragab A" first="Ahmad" last="Ragab">Ahmad Ragab</name>
<affiliation><nlm:aff id="aff0100">Intensive Care Department, King Fahd Hospital, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Harthy, Abdulrahman" sort="Al Harthy, Abdulrahman" uniqKey="Al Harthy A" first="Abdulrahman" last="Al Harthy">Abdulrahman Al Harthy</name>
<affiliation><nlm:aff id="aff0055">Intensive Care Department, King Saud Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kharaba, Ayman" sort="Kharaba, Ayman" uniqKey="Kharaba A" first="Ayman" last="Kharaba">Ayman Kharaba</name>
<affiliation><nlm:aff id="aff0105">Department of Critical Care, King Fahad Hospital, Ohoud Hospital, Al-Madinah Al-Monawarah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jose, Jesna" sort="Jose, Jesna" uniqKey="Jose J" first="Jesna" last="Jose">Jesna Jose</name>
<affiliation><nlm:aff id="aff0110">Department of Biostatistics and Bioinformatics, King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Dabbagh, Tarek" sort="Dabbagh, Tarek" uniqKey="Dabbagh T" first="Tarek" last="Dabbagh">Tarek Dabbagh</name>
<affiliation><nlm:aff id="aff0010">Intensive Care Department, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0115">King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Fowler, Robert A" sort="Fowler, Robert A" uniqKey="Fowler R" first="Robert A." last="Fowler">Robert A. Fowler</name>
<affiliation><nlm:aff id="aff0120">Institute of Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0125">Department of Critical Care Medicine and Department of Medicine, Sunnybrook Hospital, Toronto, Ontario, Canada</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Balkhy, Hanan H" sort="Balkhy, Hanan H" uniqKey="Balkhy H" first="Hanan H." last="Balkhy">Hanan H. Balkhy</name>
<affiliation><nlm:aff id="aff0005">College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0130">Department of Infection Prevention and Control, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Merson, Laura" sort="Merson, Laura" uniqKey="Merson L" first="Laura" last="Merson">Laura Merson</name>
<affiliation><nlm:aff id="aff0135">International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC), Infectious Diseases Data Observatory, Oxford University, Oxford, United Kingdom</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Hayden, Frederick G" sort="Hayden, Frederick G" uniqKey="Hayden F" first="Frederick G." last="Hayden">Frederick G. Hayden</name>
<affiliation><nlm:aff id="aff0140">International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC), Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States</nlm:aff>
</affiliation>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">PMC</idno>
<idno type="pmid">30690213</idno>
<idno type="pmc">7110878</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7110878</idno>
<idno type="RBID">PMC:7110878</idno>
<idno type="doi">10.1016/j.ijid.2019.01.041</idno>
<date when="2019">2019</date>
<idno type="wicri:Area/Pmc/Corpus">000D55</idno>
<idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000D55</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Macrolides in critically ill patients with Middle East Respiratory Syndrome</title>
<author><name sortKey="Arabi, Yaseen M" sort="Arabi, Yaseen M" uniqKey="Arabi Y" first="Yaseen M." last="Arabi">Yaseen M. Arabi</name>
<affiliation><nlm:aff id="aff0005">College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0010">Intensive Care Department, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Deeb, Ahmad M" sort="Deeb, Ahmad M" uniqKey="Deeb A" first="Ahmad M." last="Deeb">Ahmad M. Deeb</name>
<affiliation><nlm:aff id="aff0015">Research Office, King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Ministry of the National Guard − Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Hameed, Fahad" sort="Al Hameed, Fahad" uniqKey="Al Hameed F" first="Fahad" last="Al-Hameed">Fahad Al-Hameed</name>
<affiliation><nlm:aff id="aff0020">College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0025">Department of Intensive Care, Ministry of the National Guard − Health Affairs, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mandourah, Yasser" sort="Mandourah, Yasser" uniqKey="Mandourah Y" first="Yasser" last="Mandourah">Yasser Mandourah</name>
<affiliation><nlm:aff id="aff0030">Department of Intensive Care Services, Prince Sultan Military Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Almekhlafi, Ghaleb A" sort="Almekhlafi, Ghaleb A" uniqKey="Almekhlafi G" first="Ghaleb A." last="Almekhlafi">Ghaleb A. Almekhlafi</name>
<affiliation><nlm:aff id="aff0030">Department of Intensive Care Services, Prince Sultan Military Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Sindi, Anees A" sort="Sindi, Anees A" uniqKey="Sindi A" first="Anees A." last="Sindi">Anees A. Sindi</name>
<affiliation><nlm:aff id="aff0035">Department of Anesthesia and Critical Care, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Omari, Awad" sort="Al Omari, Awad" uniqKey="Al Omari A" first="Awad" last="Al-Omari">Awad Al-Omari</name>
<affiliation><nlm:aff id="aff0040">College of Medicine, Alfaisal University, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0045">Department of Intensive Care, Dr Sulaiman Al-Habib Group Hospitals, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Shalhoub, Sarah" sort="Shalhoub, Sarah" uniqKey="Shalhoub S" first="Sarah" last="Shalhoub">Sarah Shalhoub</name>
<affiliation><nlm:aff id="aff0050">Department of Medicine, Division of Infectious Diseases, King Fahad Armed Forces Hospital, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0145">Department of Medicine, Division of Infectious Diseases, University of Western Ontario, London, Canada</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Mady, Ahmed" sort="Mady, Ahmed" uniqKey="Mady A" first="Ahmed" last="Mady">Ahmed Mady</name>
<affiliation><nlm:aff id="aff0055">Intensive Care Department, King Saud Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0060">Department of Anesthesiology and Intensive Care, Tanta University Hospitals, Tanta, Egypt</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Alraddadi, Basem" sort="Alraddadi, Basem" uniqKey="Alraddadi B" first="Basem" last="Alraddadi">Basem Alraddadi</name>
<affiliation><nlm:aff id="aff0040">College of Medicine, Alfaisal University, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0065">Department of Medicine, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Almotairi, Abdullah" sort="Almotairi, Abdullah" uniqKey="Almotairi A" first="Abdullah" last="Almotairi">Abdullah Almotairi</name>
<affiliation><nlm:aff id="aff0070">Department of Critical Care Medicine, King Fahad Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Khatib, Kasim" sort="Al Khatib, Kasim" uniqKey="Al Khatib K" first="Kasim" last="Al Khatib">Kasim Al Khatib</name>
<affiliation><nlm:aff id="aff0075">Intensive Care Department, Al-Noor Specialist Hospital, Makkah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Abdulmomen, Ahmed" sort="Abdulmomen, Ahmed" uniqKey="Abdulmomen A" first="Ahmed" last="Abdulmomen">Ahmed Abdulmomen</name>
<affiliation><nlm:aff id="aff0080">Department of Critical Care Medicine, King Saud University, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Qushmaq, Ismael" sort="Qushmaq, Ismael" uniqKey="Qushmaq I" first="Ismael" last="Qushmaq">Ismael Qushmaq</name>
<affiliation><nlm:aff id="aff0065">Department of Medicine, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Solaiman, Othman" sort="Solaiman, Othman" uniqKey="Solaiman O" first="Othman" last="Solaiman">Othman Solaiman</name>
<affiliation><nlm:aff id="aff0085">King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Aithan, Abdulsalam M" sort="Al Aithan, Abdulsalam M" uniqKey="Al Aithan A" first="Abdulsalam M." last="Al-Aithan">Abdulsalam M. Al-Aithan</name>
<affiliation><nlm:aff id="aff0090">Intensive Care Department, Ministry of the National Guard - Health Affairs, Al Ahsa, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0150">King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Al Ahsa, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Raddadi, Rajaa" sort="Al Raddadi, Rajaa" uniqKey="Al Raddadi R" first="Rajaa" last="Al-Raddadi">Rajaa Al-Raddadi</name>
<affiliation><nlm:aff id="aff0095">King Abdulaziz University, Department of Family and Community Medicine, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Ragab, Ahmad" sort="Ragab, Ahmad" uniqKey="Ragab A" first="Ahmad" last="Ragab">Ahmad Ragab</name>
<affiliation><nlm:aff id="aff0100">Intensive Care Department, King Fahd Hospital, Jeddah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Al Harthy, Abdulrahman" sort="Al Harthy, Abdulrahman" uniqKey="Al Harthy A" first="Abdulrahman" last="Al Harthy">Abdulrahman Al Harthy</name>
<affiliation><nlm:aff id="aff0055">Intensive Care Department, King Saud Medical City, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Kharaba, Ayman" sort="Kharaba, Ayman" uniqKey="Kharaba A" first="Ayman" last="Kharaba">Ayman Kharaba</name>
<affiliation><nlm:aff id="aff0105">Department of Critical Care, King Fahad Hospital, Ohoud Hospital, Al-Madinah Al-Monawarah, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Jose, Jesna" sort="Jose, Jesna" uniqKey="Jose J" first="Jesna" last="Jose">Jesna Jose</name>
<affiliation><nlm:aff id="aff0110">Department of Biostatistics and Bioinformatics, King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Dabbagh, Tarek" sort="Dabbagh, Tarek" uniqKey="Dabbagh T" first="Tarek" last="Dabbagh">Tarek Dabbagh</name>
<affiliation><nlm:aff id="aff0010">Intensive Care Department, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0115">King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Fowler, Robert A" sort="Fowler, Robert A" uniqKey="Fowler R" first="Robert A." last="Fowler">Robert A. Fowler</name>
<affiliation><nlm:aff id="aff0120">Institute of Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0125">Department of Critical Care Medicine and Department of Medicine, Sunnybrook Hospital, Toronto, Ontario, Canada</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Balkhy, Hanan H" sort="Balkhy, Hanan H" uniqKey="Balkhy H" first="Hanan H." last="Balkhy">Hanan H. Balkhy</name>
<affiliation><nlm:aff id="aff0005">College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
<affiliation><nlm:aff id="aff0130">Department of Infection Prevention and Control, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Merson, Laura" sort="Merson, Laura" uniqKey="Merson L" first="Laura" last="Merson">Laura Merson</name>
<affiliation><nlm:aff id="aff0135">International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC), Infectious Diseases Data Observatory, Oxford University, Oxford, United Kingdom</nlm:aff>
</affiliation>
</author>
<author><name sortKey="Hayden, Frederick G" sort="Hayden, Frederick G" uniqKey="Hayden F" first="Frederick G." last="Hayden">Frederick G. Hayden</name>
<affiliation><nlm:aff id="aff0140">International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC), Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States</nlm:aff>
</affiliation>
</author>
</analytic>
<series><title level="j">International Journal of Infectious Diseases</title>
<idno type="ISSN">1201-9712</idno>
<idno type="eISSN">1878-3511</idno>
<imprint><date when="2019">2019</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass></textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en"><title>Highlights</title>
<p><list list-type="simple" id="lis0005"><list-item id="lsti0005"><label>•</label>
<p id="par0005">More than one-third of critically ill patients with Middle East Respiratory Syndrome Coronavirus (MERS-CoV) received empiric therapy with macrolides.</p>
</list-item>
<list-item id="lsti0010"><label>•</label>
<p id="par0010">Macrolide therapy is not significantly associated with a reduction in 90-day mortality of critically ill patients with MERS-CoV.</p>
</list-item>
<list-item id="lsti0015"><label>•</label>
<p id="par0015">Macrolide therapy is not significantly associated with improvement in MERS-CoV RNA clearance of critically ill patients with MERS-CoV.</p>
</list-item>
</list>
</p>
</div>
</front>
<back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Amsden, G W" uniqKey="Amsden G">G.W. Amsden</name>
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</analytic>
</biblStruct>
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</author>
<author><name sortKey="Al Omari, A" uniqKey="Al Omari A">A. Al-Omari</name>
</author>
<author><name sortKey="Mandourah, Y" uniqKey="Mandourah Y">Y. Mandourah</name>
</author>
<author><name sortKey="Al Hameed, F" uniqKey="Al Hameed F">F. Al-Hameed</name>
</author>
<author><name sortKey="Sindi, A A" uniqKey="Sindi A">A.A. Sindi</name>
</author>
<author><name sortKey="Alraddadi, B" uniqKey="Alraddadi B">B. Alraddadi</name>
</author>
</analytic>
</biblStruct>
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<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>
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<issn pub-type="ppub">1201-9712</issn>
<issn pub-type="epub">1878-3511</issn>
<publisher><publisher-name>The Author(s). Published by Elsevier Ltd on behalf of International Society for Infectious Diseases.</publisher-name>
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<article-meta><article-id pub-id-type="pmid">30690213</article-id>
<article-id pub-id-type="pmc">7110878</article-id>
<article-id pub-id-type="publisher-id">S1201-9712(19)30052-9</article-id>
<article-id pub-id-type="doi">10.1016/j.ijid.2019.01.041</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Article</subject>
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<title-group><article-title>Macrolides in critically ill patients with Middle East Respiratory Syndrome</article-title>
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<xref rid="aff0125" ref-type="aff">y</xref>
</contrib>
<contrib contrib-type="author" id="aut0120"><name><surname>Balkhy</surname>
<given-names>Hanan H.</given-names>
</name>
<email>BalkhyH@ngha.med.sa</email>
<xref rid="aff0005" ref-type="aff">a</xref>
<xref rid="aff0130" ref-type="aff">z</xref>
</contrib>
<contrib contrib-type="author" id="aut0125"><name><surname>Merson</surname>
<given-names>Laura</given-names>
</name>
<email>laura.merson@ndm.ox.ac.uk</email>
<xref rid="aff0135" ref-type="aff">A</xref>
</contrib>
<contrib contrib-type="author" id="aut0130"><name><surname>Hayden</surname>
<given-names>Frederick G.</given-names>
</name>
<email>fgh@virginia.edu</email>
<xref rid="aff0140" ref-type="aff">B</xref>
</contrib>
<contrib contrib-type="author"><collab>For the Saudi Critical Care Trials group</collab>
</contrib>
</contrib-group>
<aff id="aff0005"><label>a</label>
College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</aff>
<aff id="aff0010"><label>b</label>
Intensive Care Department, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</aff>
<aff id="aff0015"><label>c</label>
Research Office, King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Ministry of the National Guard − Health Affairs, Riyadh, Saudi Arabia</aff>
<aff id="aff0020"><label>d</label>
College of Medicine, King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Jeddah, Saudi Arabia</aff>
<aff id="aff0025"><label>e</label>
Department of Intensive Care, Ministry of the National Guard − Health Affairs, Jeddah, Saudi Arabia</aff>
<aff id="aff0030"><label>f</label>
Department of Intensive Care Services, Prince Sultan Military Medical City, Riyadh, Saudi Arabia</aff>
<aff id="aff0035"><label>g</label>
Department of Anesthesia and Critical Care, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia</aff>
<aff id="aff0040"><label>h</label>
College of Medicine, Alfaisal University, Riyadh, Saudi Arabia</aff>
<aff id="aff0045"><label>i</label>
Department of Intensive Care, Dr Sulaiman Al-Habib Group Hospitals, Riyadh, Saudi Arabia</aff>
<aff id="aff0050"><label>j</label>
Department of Medicine, Division of Infectious Diseases, King Fahad Armed Forces Hospital, Jeddah, Saudi Arabia</aff>
<aff id="aff0055"><label>k</label>
Intensive Care Department, King Saud Medical City, Riyadh, Saudi Arabia</aff>
<aff id="aff0060"><label>l</label>
Department of Anesthesiology and Intensive Care, Tanta University Hospitals, Tanta, Egypt</aff>
<aff id="aff0065"><label>m</label>
Department of Medicine, King Faisal Specialist Hospital and Research Center, Jeddah, Saudi Arabia</aff>
<aff id="aff0070"><label>n</label>
Department of Critical Care Medicine, King Fahad Medical City, Riyadh, Saudi Arabia</aff>
<aff id="aff0075"><label>o</label>
Intensive Care Department, Al-Noor Specialist Hospital, Makkah, Saudi Arabia</aff>
<aff id="aff0080"><label>p</label>
Department of Critical Care Medicine, King Saud University, Riyadh, Saudi Arabia</aff>
<aff id="aff0085"><label>q</label>
King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia</aff>
<aff id="aff0090"><label>r</label>
Intensive Care Department, Ministry of the National Guard - Health Affairs, Al Ahsa, Saudi Arabia</aff>
<aff id="aff0095"><label>s</label>
King Abdulaziz University, Department of Family and Community Medicine, Jeddah, Saudi Arabia</aff>
<aff id="aff0100"><label>t</label>
Intensive Care Department, King Fahd Hospital, Jeddah, Saudi Arabia</aff>
<aff id="aff0105"><label>u</label>
Department of Critical Care, King Fahad Hospital, Ohoud Hospital, Al-Madinah Al-Monawarah, Saudi Arabia</aff>
<aff id="aff0110"><label>v</label>
Department of Biostatistics and Bioinformatics, King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</aff>
<aff id="aff0115"><label>w</label>
King Saud bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, Riyadh, Saudi Arabia</aff>
<aff id="aff0120"><label>x</label>
Institute of Health Policy Management and Evaluation, University of Toronto, Toronto, Ontario, Canada</aff>
<aff id="aff0125"><label>y</label>
Department of Critical Care Medicine and Department of Medicine, Sunnybrook Hospital, Toronto, Ontario, Canada</aff>
<aff id="aff0130"><label>z</label>
Department of Infection Prevention and Control, Ministry of the National Guard – Health Affairs, Riyadh, Saudi Arabia</aff>
<aff id="aff0135"><label>A</label>
International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC), Infectious Diseases Data Observatory, Oxford University, Oxford, United Kingdom</aff>
<aff id="aff0140"><label>B</label>
International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC), Division of Infectious Diseases and International Health, Department of Medicine, University of Virginia School of Medicine, Charlottesville, VA, United States</aff>
<aff id="aff0145"><label>C</label>
Department of Medicine, Division of Infectious Diseases, University of Western Ontario, London, Canada</aff>
<aff id="aff0150"><label>D</label>
King Abdullah International Medical Research Center, King Saud bin Abdulaziz University for Health Sciences, Al Ahsa, Saudi Arabia</aff>
<author-notes><corresp id="cor0005"><label>⁎</label>
Corresponding author at: King Saud Bin Abdulaziz University for Health Sciences, King Abdullah International Medical Research Center, P.O. Box 22490, Riyadh 11426, Saudi Arabia. <email>arabi@ngha.med.sa</email>
</corresp>
</author-notes>
<pub-date pub-type="pmc-release"><day>25</day>
<month>1</month>
<year>2019</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>4</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub"><day>25</day>
<month>1</month>
<year>2019</year>
</pub-date>
<volume>81</volume>
<fpage>184</fpage>
<lpage>190</lpage>
<history><date date-type="received"><day>2</day>
<month>11</month>
<year>2018</year>
</date>
<date date-type="rev-recd"><day>18</day>
<month>1</month>
<year>2019</year>
</date>
<date date-type="accepted"><day>21</day>
<month>1</month>
<year>2019</year>
</date>
</history>
<permissions><copyright-statement>© 2019 The Author(s)</copyright-statement>
<copyright-year>2019</copyright-year>
<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">More than one-third of critically ill patients with Middle East Respiratory Syndrome Coronavirus (MERS-CoV) received empiric therapy with macrolides.</p>
</list-item>
<list-item id="lsti0010"><label>•</label>
<p id="par0010">Macrolide therapy is not significantly associated with a reduction in 90-day mortality of critically ill patients with MERS-CoV.</p>
</list-item>
<list-item id="lsti0015"><label>•</label>
<p id="par0015">Macrolide therapy is not significantly associated with improvement in MERS-CoV RNA clearance of critically ill patients with MERS-CoV.</p>
</list-item>
</list>
</p>
</abstract>
<abstract id="abs0010"><sec><title>Objectives</title>
<p>Macrolides have been reported to be associated with improved outcomes in patients with viral pneumonia related to influenza and other viruses, possibly because of their immune-modulatory effects. Macrolides have frequently been used in patients with Middle East Respiratory Syndrome (MERS). This study investigated the association of macrolides with 90-day mortality and MERS coronavirus (CoV) RNA clearance in critically ill patients with MERS.</p>
</sec>
<sec><title>Methods</title>
<p>This retrospective analysis of a multicenter cohort database included 14 tertiary-care hospitals in five cities in Saudi Arabia. Multivariate logistic-regression analysis was used to determine the association of macrolide therapy with 90-day mortality, and the Cox-proportional hazard model to determine the association of macrolide therapy with MERS-CoV RNA clearance.</p>
</sec>
<sec><title>Results</title>
<p>Of 349 critically ill MERS patients, 136 (39%) received macrolide therapy. Azithromycin was most commonly used (97/136; 71.3%). Macrolide therapy was commonly started before the patient arrived in the intensive care unit (ICU) (51/136; 37.5%), or on day1 in ICU (53/136; 39%). On admission to ICU, the baseline characteristics of patients who received and did not receive macrolides were similar, including demographic data and sequential organ failure assessment score. However, patients who received macrolides were more likely to be admitted with community-acquired MERS (<italic>P</italic>
= 0.02). Macrolide therapy was not independently associated with a significant difference in 90-day mortality (adjusted odds ratio [OR]: 0.84; 95% confidence interval [CI] :0.47–1.51; <italic>P</italic>
= 0.56) or MERS-CoV RNA clearance (adjusted HR: 0.88; 95% CI:0.47–1.64; <italic>P</italic>
= 0.68).</p>
</sec>
<sec><title>Conclusions</title>
<p>These findings indicate that macrolide therapy is not associated with a reduction in 90-day mortality or improvement in MERS-CoV RNA clearance.</p>
</sec>
</abstract>
<kwd-group id="kwd0005"><title>Keywords</title>
<kwd>Macrolides</kwd>
<kwd>MERS-CoV</kwd>
<kwd>Critical care</kwd>
<kwd>Pneumonia</kwd>
<kwd>Influenza</kwd>
<kwd>Azithromycin</kwd>
</kwd-group>
</article-meta>
<notes><p id="misc0005"><bold>Corresponding Editor:</bold>
Eskild Petersen, Aarhus, Denmark</p>
</notes>
</front>
<body><sec id="sec0005"><title>Introduction</title>
<p id="par0020">Macrolides are bacteriostatic antibiotics with a broad spectrum of activity against many Gram-positive and atypical bacterial species commonly associated with respiratory tract infections (<xref rid="bib0085" ref-type="bibr">Min and Jang, 2012</xref>
, <xref rid="bib0100" ref-type="bibr">NIH, 2017</xref>
). As well as their antibacterial effects, macrolides have been shown to have immune-modulatory and anti-inflammatory effects (<xref rid="bib0005" ref-type="bibr">Amsden, 2005</xref>
, <xref rid="bib0055" ref-type="bibr">Kanoh and Rubin, 2010</xref>
, <xref rid="bib0095" ref-type="bibr">Nakamura et al., 1999</xref>
, <xref rid="bib0145" ref-type="bibr">Wales and Woodhead, 1999</xref>
, <xref rid="bib0160" ref-type="bibr">Zarogoulidis et al., 2012</xref>
). Morbidity and mortality caused by respiratory viral infections is associated with the excessive elaboration of cytokines and immunopathologic host inflammatory responses (<xref rid="bib0085" ref-type="bibr">Min and Jang, 2012</xref>
, <xref rid="bib0090" ref-type="bibr">Mosquera et al., 2014</xref>
, <xref rid="bib0135" ref-type="bibr">Us, 2008</xref>
, <xref rid="bib0155" ref-type="bibr">Wang et al., 2012</xref>
). Pre-clinical and clinical studies have shown that macrolides downregulate the inflammatory response, attenuating extreme cytokine production and promote the induction of immunoglobulin antibodies (<xref rid="bib0025" ref-type="bibr">Bermejo-Martin et al., 2009</xref>
), which may reduce the complications of respiratory viral infections (<xref rid="bib0065" ref-type="bibr">Lee et al., 2017</xref>
, <xref rid="bib0070" ref-type="bibr">Lendermon et al., 2017</xref>
, <xref rid="bib0085" ref-type="bibr">Min and Jang, 2012</xref>
, <xref rid="bib0135" ref-type="bibr">Us, 2008</xref>
, <xref rid="bib0155" ref-type="bibr">Wang et al., 2012</xref>
). Given these properties, macrolides (e.g., azithromycin, clarithromycin, erythromycin, fidaxomicin, telithromycin) have been studied for their potential use as targeted therapy for a wide spectrum of viral respiratory infections including influenza (<xref rid="bib0025" ref-type="bibr">Bermejo-Martin et al., 2009</xref>
, <xref rid="bib0085" ref-type="bibr">Min and Jang, 2012</xref>
, <xref rid="bib0125" ref-type="bibr">Suzuki et al., 2002</xref>
, <xref rid="bib0130" ref-type="bibr">Tahan et al., 2007</xref>
, <xref rid="bib0165" ref-type="bibr">Zhang et al., 2010</xref>
).</p>
<p id="par0025">Clinical studies of macrolides in patients with viral respiratory infections have yielded contradictory results. In a retrospective analysis, use of clarithromycin with oseltamivir or zanamivir was associated with restoration of attenuated antiviral mucosal and systemic immunity and reduction in the re-infection rate in pediatric patients with influenza (<xref rid="bib0120" ref-type="bibr">Shinahara et al., 2013</xref>
). In another study, pediatric patients with influenza-related symptoms were randomly assigned to groups receiving either cephalosporins or macrolides. In this study, macrolides were found to be more effective for alleviating fever and reducing the occurrence of pneumonia (<xref rid="bib0105" ref-type="bibr">Ninomiya et al., 2002</xref>
). In a double-blind randomised controlled trial (RCT) involving infants with respiratory syncytial virus (RSV)-related bronchiolitis, administration of clarithromycin daily for three weeks was associated with reduction in hospital length of stay (LOS), supplemental oxygen, the need for β2-agonists, and hospital readmission. In addition, it was associated with reduction in plasma interleukin-4 (IL-4), IL-8 and eotaxin levels (<xref rid="bib0130" ref-type="bibr">Tahan et al., 2007</xref>
). In an open-label, prospective RCT, clarithromycin was associated with fever reduction in adult patients with influenza A/H1N1pdm09 infection who were treated with neuraminidase inhibitors. However, there was no difference in the reduction of serum IL-6 levels between the study groups (<xref rid="bib0035" ref-type="bibr">Higashi et al., 2014</xref>
). Similarly, in a multicenter, open-label RCT, a combination therapy of osteltamivir and azithromycin was associated with early resolution of some clinical symptoms but no difference in inflammatory cytokine levels (<xref rid="bib0050" ref-type="bibr">Kakeya et al., 2014</xref>
). In a recent open-label RCT of hospitalized adults, early combination therapy with clarithromycin, naproxen and oseltamivir was associated with reduced 30-day and 90-day mortality and hospital LOS compared to oseltamivir monotherapy (<xref rid="bib0040" ref-type="bibr">Hung et al., 2017</xref>
). Similar results were obtained from secondary analysis of a multicenter RCT, in which use of the macrolides azithromycin, clarithromycin, or erythromycin was associated with improved outcomes, including mortality, in patients with acute lung injury (<xref rid="bib0150" ref-type="bibr">Walkey and Wiener, 2012</xref>
).</p>
<p id="par0030">On the other hand, in a multicenter, double-blind, placebo-controlled equivalence RCT, use of azithromycin to treat infants and young children with RSV was not associated with improved clinical symptoms (<xref rid="bib0060" ref-type="bibr">Kneyber et al., 2008</xref>
). Similarly, placebo-controlled RCTs in infants and children have shown that use of azithromycin for bronchiolitis does not reduce length of stay, oxygen requirement or readmission (<xref rid="bib0080" ref-type="bibr">McCallum et al., 2013</xref>
, <xref rid="bib0110" ref-type="bibr">Pinto et al., 2012</xref>
). In one multicenter, observational study, macrolides were not associated with improved survival in critically ill patients with A(H1N1)pdm09-associated primary viral pneumonia (<xref rid="bib0075" ref-type="bibr">Martin-Loeches et al., 2013</xref>
).</p>
<p id="par0035">In patients with Middle East Respiratory Syndrome (MERS), macrolides are often prescribed as part of the empiric treatment regimen for pneumonia, often before the detection of MERS coronavirus (MERS-CoV) However, the association of macrolides with MERS outcomes has not been investigated rigorously. Using a cohort of critically ill patients with MERS, the aim of this study was to determine whether there was an association between macrolide therapy and 90-day mortality, and between macrolide treatment and MERS-CoV RNA clearance from respiratory secretions.</p>
</sec>
<sec id="sec0010"><title>Material and methods</title>
<sec id="sec0015"><title>Setting</title>
<p id="par0040">This was a retrospective analysis of a multicenter cohort study, which included 14 tertiary care hospitals in five cities in Saudi Arabia. Details of the original cohort have been previously published (<xref rid="bib0010" ref-type="bibr">Arabi et al., 2017</xref>
). The study was approved by the institutional review boards of all participating centers. Patient-level informed consent was not required due to its observational nature.</p>
</sec>
<sec id="sec0020"><title>Patients</title>
<p id="par0045">The study included all patients who were admitted to the participating hospitals between September 2012 and January 2018 and who were critically ill with laboratory-confirmed MERS. In this retrospective analysis, patients were divided into one of two treatment groups: a ‘macrolide therapy group’, in which patients received macrolide treatment (azithromycin, clarithromycin or erythromycin) within three days before admission to ICU, or at any time during their stay in ICU, up to 28 days and a ‘no macrolide therapy’ (control) group consisting of patients not given macrolides during the same timeframe. Macrolides were typically administered as part of empiric therapy for pneumonia, although some patients received erythromycin as a gastrointestinal prokinetic agent.</p>
</sec>
<sec id="sec0025"><title>Data collection</title>
<p id="par0050">A standardised case report form was used for data collection (<xref rid="bib0045" ref-type="bibr">ISARIC</xref>
). Data extracted included patient demographic features; underlying comorbidities; and the durations between symptom onset and presentation to the Emergency Department, ICU admission and intubation. Severity of patients’ illness was assessed using the sequential organ failure assessment (SOFA) score, as well as laboratory and ventilator parameters on days 1, 3, 7, 14 and 28 of ICU admission (<xref rid="bib0140" ref-type="bibr">Vincent et al., 1998</xref>
). The results of diagnostic tests were documented, including those for bacterial co-pathogens; ‘atypical’ pathogens including legionella, chlamydia and mycoplasma; and other viral infections in the first three days of ICU admission. Details of any other antibiotics given within the first three days of ICU admission were also documented. The primary outcome was 90-day all-cause mortality. We also examined the time to clearance of MERS-CoV rRT-PCR defined as the time from ICU admission until the test was negative on two occasions, without a positive test afterward. Clearance of MERS-CoV rRT-PCR was calculated on patients who had at least one follow-up rRT-PCR test in the ICU from the date of ICU admission, and censored by the date of last test or death whichever comes first.</p>
</sec>
<sec id="sec0030"><title>Statistical analysis</title>
<p id="par0055">We compared the baseline characteristics, co-interventions, and outcomes of patients who received macrolide therapy and those who did not. For categorical variables, the Chi-square test or Fisher’s exact test were used, and for continuous variables, Student’s t-test or the Mann–Whitney U test were used as appropriate.</p>
<p id="par0060">To examine the association between macrolide therapy and 90-day mortality, we performed multivariable logistic regression analysis, with macrolide therapy being the independent variable. The model included baseline variables of clinical interest, decided a priori, and significant co-variables at the univariable level (P ≤ 0.2) that included: body mass index (BMI), SOFA score at admission to ICU, community-acquired (versus hospital-acquired) infection, healthcare worker-associated infection, non-invasive ventilation at ICU admission, malignancy, chronic pulmonary disease, and liver disease. Sensitivity analysis was conducted by excluding patients who received macrolides after the third day of ICU admission.</p>
<p id="par0065">To examine the association between macrolide therapy and MERS-CoV RNA clearance, we used a Cox proportional hazard model, with macrolide therapy being the independent variable. We included in this model the same covariables mentioned above. Because of the competing nature of MERS-CoV RNA clearance and death, we performed further analysis restricting to survivors.</p>
</sec>
</sec>
<sec id="sec0035"><title>Results</title>
<sec id="sec0040"><title>Patient characteristics</title>
<p id="par0070">Out of 349 critically ill MERS patients, 136 (39%) received macrolide therapy. Of these, 97/136 (71.3%) received azithromycin, 28/136 (20.6%) received clarithromycin, and 22/136 (16.2%) received erythromycin with 11 patients received two macrolides at different times during the study period. Most patients who received macrolides had already been started on this therapy before arriving to ICU (51/136; 37.5%) or were started on the first day in ICU (53/136; 39%) (<xref rid="fig0005" ref-type="fig">Figure 1</xref>
).<fig id="fig0005"><label>Figure 1</label>
<caption><p>Time to initiation of macrolide therapy from ICU admission among critically ill patients with Middle East Respiratory Syndrome (MERS). Day 0 includes patients who were already on macrolides therapy before being admitted to ICU. There were 11 patients who recieved two macrolides at different times during the study period, and one patient with missing data regarding the date of macrolide therapy.</p>
</caption>
<alt-text id="at0035">Figure 1</alt-text>
<graphic xlink:href="gr1_lrg"></graphic>
</fig>
</p>
<p id="par0075">The demographic characteristics, physiological parameters, comorbidities and presenting symptoms of patients between the two study groups were very similar (<xref rid="tbl0005" ref-type="table">Table 1</xref>
and Supplementary Table 1). However, patients in the macrolide therapy group were more likely to have community-acquired MERS (81/136; 59.6%) than those in the control group (104/213; 48.8%; <italic>P</italic>
= 0.02), and had a slightly higher mean arterial pressure at ICU admission. Patients not receiving macrolides had more liver disease, had slightly higher international normalised ratio (INR) readings, and slightly higher bilirubin levels at ICU admission.<table-wrap position="float" id="tbl0005"><label>Table 1</label>
<caption><p>Baseline characteristics and physiological parameters of critically ill patients with Middle East Respiratory Syndrome (MERS) who received or did not receive macrolide therapy.</p>
</caption>
<alt-text id="at0040">Table 1</alt-text>
<table frame="hsides" rules="groups"><thead><tr><th align="left">Variables</th>
<th align="left">Macrolides group<break></break>
(n = 136)</th>
<th align="left">No macrolides group<break></break>
(n = 213)</th>
<th align="left">P-value</th>
</tr>
</thead>
<tbody><tr><td align="left">Age (years), median (Q1, Q3)</td>
<td align="left">56 (42, 67)</td>
<td align="left">58 (47, 71)</td>
<td align="left">0.23^</td>
</tr>
<tr><td align="left">BMI (kg/m<sup>2</sup>
), median (Q1, Q3)</td>
<td align="left">29 (25, 34)</td>
<td align="left">28 (23, 33)</td>
<td align="left">0.08^</td>
</tr>
<tr><td align="left">Male gender, n (%)</td>
<td align="left">97 (71.3)</td>
<td align="left">144 (67.6)</td>
<td align="left">0.46**</td>
</tr>
<tr><td colspan="4" align="left">
</td>
</tr>
<tr><td align="left">Occupation</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
</tr>
<tr><td align="left">Healthcare worker, n (%)</td>
<td align="left">16 (11.8)</td>
<td align="left">16 (7.5)</td>
<td align="left" valign="middle" rowspan="3">0.02**</td>
</tr>
<tr><td align="left">Community-acquired, n (%)</td>
<td align="left">81 (59.6)</td>
<td align="left">104 (48.8)</td>
</tr>
<tr><td align="left">Hospital-acquired, n (%)</td>
<td align="left">39 (28.7)</td>
<td align="left">93 (43.7)</td>
</tr>
<tr><td colspan="4" align="left">
</td>
</tr>
<tr><td align="left">Duration of illness</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
</tr>
<tr><td align="left">Days from onset of symptoms to emergency room presentation, median (Q1, Q3)</td>
<td align="left">5 (3, 8)</td>
<td align="left">4 (3, 8)</td>
<td align="left">0.79^</td>
</tr>
<tr><td align="left">Days from onset of symptoms to ICU admission, median (Q1, Q3)</td>
<td align="left">7 (4, 10)</td>
<td align="left">7 (4, 12)</td>
<td align="left">0.23^</td>
</tr>
<tr><td align="left">Days from onset of symptoms to intubation, median (Q1, Q3), N = 214</td>
<td align="left">8 (5, 11)</td>
<td align="left">8 (5, 13)</td>
<td align="left">0.11^</td>
</tr>
<tr><td colspan="4" align="left">
</td>
</tr>
<tr><td align="left">Comorbidities</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
</tr>
<tr><td align="left">Any comorbidity, n (%)</td>
<td align="left">106 (77.9)</td>
<td align="left">175 (82.2)</td>
<td align="left">0.33**</td>
</tr>
<tr><td align="left">Diabetes with chronic complications, n (%)</td>
<td align="left">72 (52.9)</td>
<td align="left">98 (46.0)</td>
<td align="left">0.21**</td>
</tr>
<tr><td align="left">Asthma/chronic pulmonary disease, n (%)</td>
<td align="left">14 (10.3)</td>
<td align="left">32 (15.0)</td>
<td align="left">0.20**</td>
</tr>
<tr><td align="left">Liver disease, n (%)</td>
<td align="left">4 (2.9)</td>
<td align="left">18 (8.5)</td>
<td align="left">0.04**</td>
</tr>
<tr><td align="left">Renal disease, n (%)</td>
<td align="left">41 (30.1)</td>
<td align="left">68 (31.9)</td>
<td align="left">0.73**</td>
</tr>
<tr><td align="left">Chronic cardiac disease, n (%)</td>
<td align="left">54 (39.7)</td>
<td align="left">83 (39.0)</td>
<td align="left">0.89**</td>
</tr>
<tr><td align="left">Chronic neurological disease/hemiplegia or paraplegia or dementia, n (%)</td>
<td align="left">12 (8.8)</td>
<td align="left">26 (12.2)</td>
<td align="left">0.32**</td>
</tr>
<tr><td align="left">Rheumatological disease, n (%)</td>
<td align="left">1 (0.7)</td>
<td align="left">6 (2.8)</td>
<td align="left">0.25^^</td>
</tr>
<tr><td align="left">Any malignancy (solid tumors, leukemia or lymphoma), n (%)</td>
<td align="left">9 (6.6)</td>
<td align="left">25 (11.7)</td>
<td align="left">0.12**</td>
</tr>
<tr><td align="left">Immunosuppressant use prior to admission, n (%)</td>
<td align="left">8 (5.9)</td>
<td align="left">13 (6.1)</td>
<td align="left">0.93**</td>
</tr>
<tr><td align="left"><bold>Physiological parameters on ICU day 1</bold>
</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
</tr>
<tr><td align="left">SOFA score, median (Q1, Q3)</td>
<td align="left">9 (5, 11.5)</td>
<td align="left">9 (6, 13)</td>
<td align="left">0.14^</td>
</tr>
<tr><td align="left">Glascow coma score, median (Q1, Q3)</td>
<td align="left">11 (3, 15)</td>
<td align="left">10 (3, 15)</td>
<td align="left">0.70^</td>
</tr>
<tr><td align="left">Tidal volume (ml), median (Q1, Q3)</td>
<td align="left">394 (350, 433)</td>
<td align="left">400 (350, 450)</td>
<td align="left">0.37^</td>
</tr>
<tr><td align="left">PEEP (cmH<sub>2</sub>
0), median (Q1, Q3)</td>
<td align="left">12 (10, 15)</td>
<td align="left">10 (8, 14)</td>
<td align="left">0.14^</td>
</tr>
<tr><td align="left">Plateau pressure (cmH<sub>2</sub>
0), median (Q1, Q3)</td>
<td align="left">28 (23, 30)</td>
<td align="left">28 (22, 32)</td>
<td align="left">0.77^</td>
</tr>
<tr><td align="left">PaO<sub>2</sub>
/FiO<sub>2</sub>
ratio, median (Q1, Q3)</td>
<td align="left">97 (64, 163)</td>
<td align="left">113 (69, 156)</td>
<td align="left">0.75^</td>
</tr>
<tr><td align="left">Mean arterial pressure (mmHg), median (Q1, Q3)</td>
<td align="left">71 (60, 83)</td>
<td align="left">68 (58, 79)</td>
<td align="left">0.04^</td>
</tr>
<tr><td align="left">White blood cell count (×10<sup>9</sup>
/L), median (Q1, Q3)</td>
<td align="left">6 (4, 10)</td>
<td align="left">7.7 (5, 12)</td>
<td align="left">0.07^</td>
</tr>
<tr><td align="left">Lactate (mmol/L), median (Q1, Q3)</td>
<td align="left">1.6 (1.0, 2.4)</td>
<td align="left">1.9 (1.2, 3.1)</td>
<td align="left">0.06^</td>
</tr>
<tr><td align="left">INR, median (Q1, Q3)</td>
<td align="left">1.1 (1.0, 1.2)</td>
<td align="left">1.2 (1.0, 1.4)</td>
<td align="left">0.0004^</td>
</tr>
<tr><td align="left">Creatinine (μmol/L), median (Q1, Q3)</td>
<td align="left">133.5 (74, 312)</td>
<td align="left">125.5 (75, 252)</td>
<td align="left">0.71^</td>
</tr>
<tr><td align="left">Bilirubin level (μmol/L), median (Q1, Q3)</td>
<td align="left">10 (6.8, 18)</td>
<td align="left">13 (7.8, 24)</td>
<td align="left">0.02^</td>
</tr>
<tr><td align="left">Platelets (×10<sup>9</sup>
/L), median (Q1, Q3)</td>
<td align="left">182 (120, 253)</td>
<td align="left">170 (113, 252)</td>
<td align="left">0.59^</td>
</tr>
<tr><td colspan="4" align="left">
</td>
</tr>
<tr><td align="left"><bold>ICU intervention at day 1</bold>
</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
</tr>
<tr><td align="left">Non-invasive positive pressure ventilation, n (%)</td>
<td align="left">26 (19.1)</td>
<td align="left">25 (11.7)</td>
<td align="left">0.06**</td>
</tr>
<tr><td align="left">Invasive ventilation, n (%)</td>
<td align="left">87 (64.0)</td>
<td align="left">127 (59.6)</td>
<td align="left">0.42**</td>
</tr>
<tr><td align="left">High-frequency oscillation ventilation, n (%)</td>
<td align="left">1 (0.7)</td>
<td align="left">2 (0.9)</td>
<td align="left">>0.99^^</td>
</tr>
<tr><td align="left">ECMO, n (%)</td>
<td align="left">2 (1.5)</td>
<td align="left">4 (1.9)</td>
<td align="left">>0.99^^</td>
</tr>
<tr><td align="left">Nitric oxide, n (%)</td>
<td align="left">3 (2.2)</td>
<td align="left">2 (0.9)</td>
<td align="left">0.38^^</td>
</tr>
<tr><td align="left">Prone positioning, n (%)</td>
<td align="left">4 (2.9)</td>
<td align="left">6 (2.8)</td>
<td align="left">>0.99^^</td>
</tr>
<tr><td align="left">Vasopressors, n (%)</td>
<td align="left">57 (41.9)</td>
<td align="left">103 (48.4)</td>
<td align="left">0.24**</td>
</tr>
<tr><td align="left">Intravenous immunoglobin, n (%)</td>
<td align="left">2 (1.5)</td>
<td align="left">1 (0.5)</td>
<td align="left">0.56^^</td>
</tr>
<tr><td align="left">Renal replacement therapy, n (%)</td>
<td align="left">25 (18.4)</td>
<td align="left">34 (16.0)</td>
<td align="left">0.56**</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn><p>SOFA: sequential organ failure assessment, FiO<sub>2</sub>
: denotes the fraction of inspired oxygen, PaO<sub>2</sub>
: partial pressure of oxygen in arterial blood, PEEP: positive end-expiratory pressure, WBC: white blood cells, INR: international normalised ratio. For continuous variables, the ^Mann–Whitney U test was used to calculate <italic>P</italic>
values except for those labelled with *, which indicates the use of Student’s t-test. For categorical variables, the **Chi-square test was used to calculate <italic>P</italic>
values except for those labelled with ^^, which indicates the use of Fisher’s exact test.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</p>
<p id="par0080">There was no significant difference between the groups in terms of the number of days from onset of symptoms to emergency room presentation, to ICU admission and to intubation (<xref rid="tbl0005" ref-type="table">Table 1</xref>
).</p>
</sec>
<sec id="sec0045"><title>Co-pathogens and other antibiotics</title>
<p id="par0085">As shown in Supplementary Table 2, co-infection with a respiratory virus was confirmed in 21 patients (10 patients in the macrolide therapy group and 11 in the control group). Atypical co-pathogens were diagnosed in a small number of patients (legionella, 1; chlamydia, 1; mycoplasma, 3). Other antibiotics received by patients are shown in Supplementary Table 3.</p>
</sec>
<sec id="sec0050"><title>Co-interventions</title>
<p id="par0090">Throughout their stay in ICU, patients in the macrolide therapy group received more high-frequency oscillation ventilation (19/136; 14%) than those in the control group (7/213; 3.3%; <italic>P </italic>
= 0.0002), oseltamiver therapy (99/136; 72.8% versus 97/213; 45.5%; <italic>P</italic>
<italic>=</italic>
0.0001), intravenous immunoglobin (15/136; 11% versus 9/213; 4.2%; <italic>P</italic>
= 0.01), and more renal replacement therapy (79/136; 58.1% versus 95/213; 44.6%; <italic>P</italic>
= 0.01) (<xref rid="tbl0010" ref-type="table">Table 2</xref>
).<table-wrap position="float" id="tbl0010"><label>Table 2</label>
<caption><p>ICU course and outcomes among critically ill patients with Middle East Respiratory Syndrome (MERS) who received or did not receive macrolide therapy.</p>
</caption>
<alt-text id="at0045">Table 2</alt-text>
<table frame="hsides" rules="groups"><thead><tr><th align="left">Variables</th>
<th align="left">Macrolide group<break></break>
(n = 136)</th>
<th align="left">No macrolides group<break></break>
(n = 213)</th>
<th align="left">P-value</th>
</tr>
</thead>
<tbody><tr><td align="left">Non-invasive positive pressure ventilation, n (%)</td>
<td align="left">49 (36.0)</td>
<td align="left">57 (26.8)</td>
<td align="left">0.07**</td>
</tr>
<tr><td align="left">Invasive ventilation, n (%)</td>
<td align="left">117 (86.0)</td>
<td align="left">180 (84.5)</td>
<td align="left">0.70**</td>
</tr>
<tr><td align="left">Neuromuscular blockade, n (%)</td>
<td align="left">59 (43.4)</td>
<td align="left">74 (34.7)</td>
<td align="left">0.11**</td>
</tr>
<tr><td align="left">High-frequency oscillation ventilation, n (%)</td>
<td align="left">19 (14.0)</td>
<td align="left">7 (3.3)</td>
<td align="left">0.0002**</td>
</tr>
<tr><td align="left">ECMO, n (%)</td>
<td align="left">10 (7.4)</td>
<td align="left">12 (5.6)</td>
<td align="left">0.52**</td>
</tr>
<tr><td align="left">Nitric oxide, n (%)</td>
<td align="left">23 (16.9)</td>
<td align="left">21 (9.9)</td>
<td align="left">0.05**</td>
</tr>
<tr><td align="left">Prone positioning, n (%)</td>
<td align="left">18 (13.2)</td>
<td align="left">15 (7.0)</td>
<td align="left">0.05**</td>
</tr>
<tr><td align="left">Vasopressors, n (%)</td>
<td align="left">107 (78.7)</td>
<td align="left">169 (79.3)</td>
<td align="left">0.88**</td>
</tr>
<tr><td align="left">Antivirals, n (%)</td>
<td align="left">118 (86.8)</td>
<td align="left">169 (79.3)</td>
<td align="left">0.08**</td>
</tr>
<tr><td align="left">Oseltamivir, n (%)</td>
<td align="left">99 (72.8)</td>
<td align="left">97 (45.5)</td>
<td align="left">< 0.0001**</td>
</tr>
<tr><td align="left">Corticosteroids, n (%)</td>
<td align="left">76 (55.9)</td>
<td align="left">102 (47.9)</td>
<td align="left">0.15**</td>
</tr>
<tr><td align="left">Intravenous immunoglobin, n (%)</td>
<td align="left">15 (11.0)</td>
<td align="left">9 (4.2)</td>
<td align="left">0.01**</td>
</tr>
<tr><td align="left">Renal replacement therapy, n (%)</td>
<td align="left">79 (58.1)</td>
<td align="left">95 (44.6)</td>
<td align="left">0.01**</td>
</tr>
<tr><td align="left">ICU mortality, n (%)</td>
<td align="left">81 (59.6)</td>
<td align="left">146 (68.5)</td>
<td align="left">0.09**</td>
</tr>
<tr><td align="left">Hospital mortality, n (%)</td>
<td align="left">86 (63.2)</td>
<td align="left">151 (70.9)</td>
<td align="left">0.14**</td>
</tr>
<tr><td align="left">90-day mortality, n (%)</td>
<td align="left">82 (60.3)</td>
<td align="left">150 (70.4)</td>
<td align="left">0.05**</td>
</tr>
<tr><td align="left">MERS-CoV RNA clearance<xref rid="tblfn0005" ref-type="table-fn">a</xref>
, days, median (Q1, Q3)</td>
<td align="left">26 (19, 33)</td>
<td align="left">21 (17, 28)</td>
<td align="left">0.93</td>
</tr>
<tr><td align="left">ICU length of stay, days, median (Q1, Q3)</td>
<td align="left">11 (6, 21)</td>
<td align="left">8 (5, 17)</td>
<td align="left">0.09^</td>
</tr>
<tr><td align="left">Hospital length of stay, days, median (Q1,Q3)</td>
<td align="left">16 (8.5, 34)</td>
<td align="left">20 (11, 35)</td>
<td align="left">0.08^</td>
</tr>
<tr><td align="left">Invasive ventilation duration, days, median (Q1, Q3)</td>
<td align="left">11 (6, 18)</td>
<td align="left">8 (4, 15)</td>
<td align="left">0.04^</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn id="spar0025"><p>ECMO: extracorporeal membrane oxygenation, ICU: intensive care unit.</p>
</fn>
<fn id="spar0030"><p>For continuous variables, the ^Mann–Whitney U test was used to calculate P values except for those labelled with *, which indicates the use of Student’s t-test. For categorical variables, the **Chi-square test was used to calculate P values except for those labelled with ^^, which indicates the use of Fisher’s exact test.</p>
</fn>
</table-wrap-foot>
<table-wrap-foot><fn id="tblfn0005"><label>a</label>
<p id="npar0005">Clearance of MERS-CoV rRT-PCR was calculated on patients who had at least one follow-up rRT-PCR test in the ICU from the date of ICU admission, and censored by the date of last test or death whichever comes first.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</p>
</sec>
<sec id="sec0055"><title>Clinical outcomes</title>
<sec id="sec0060"><title>Mortality</title>
<p id="par0095">As shown in <xref rid="tbl0010" ref-type="table">Table 2</xref>
, there were no statistically significant differences between crude ICU and hospital mortality, 90-day mortality and ICU, and hospital LOS between the ‘macrolide therapy’ group and ‘no macrolide therapy’ group. After adjusting baseline variables, macrolide therapy was not associated with a reduction in 90-day mortality compared with the no macrolide therapy group (adjusted OR: 0.84; 95% CI: 0.47–1.51; <italic>P</italic>
= 0.56) (<xref rid="tbl0015" ref-type="table">Table 3</xref>
). Sensitivity analysis excluding those patients who received macrolides after day 3 showed similar results (adjusted OR: 0.70; 95% CI: 0.39–1.28; <italic>P</italic>
= 0.25).<table-wrap position="float" id="tbl0015"><label>Table 3</label>
<caption><p>Association of macrolide therapy with 90-day mortality and with MERS-CoV RNA clearance in critically ill patients with Middle East Respiratory Syndrome (MERS).</p>
</caption>
<alt-text id="at0050">Table 3</alt-text>
<table frame="hsides" rules="groups"><thead><tr><th colspan="4" align="left">Day-90 mortality<hr></hr>
</th>
<th colspan="3" align="left">MERS-CoV RNA clearance<xref rid="tblfn0010" ref-type="table-fn">a</xref>
<hr></hr>
</th>
</tr>
<tr><th align="left">Variables</th>
<th colspan="3" align="left">Logistic regression<hr></hr>
</th>
<th colspan="3" align="left">Cox proportional hazard model<hr></hr>
</th>
</tr>
<tr><th align="left"></th>
<th align="left">n</th>
<th align="left">OR<break></break>
(95% CI)</th>
<th align="left">P-value</th>
<th align="left">n</th>
<th align="left">HR<break></break>
(95% CI)</th>
<th align="left">P-value</th>
</tr>
</thead>
<tbody><tr><td align="left">Macrolides vs no macrolides (ref)</td>
<td align="left">268</td>
<td align="left">0.84<break></break>
(0.47, 1.51)</td>
<td align="left">0.56</td>
<td align="left">137</td>
<td align="left">0.88<break></break>
(0.47, 1.64)</td>
<td align="left">0.68</td>
</tr>
<tr><td colspan="7" align="left">
</td>
</tr>
<tr><td align="left">Macrolides vs no macrolides (ref) among survivors</td>
<td align="left"></td>
<td align="left"></td>
<td align="left"></td>
<td align="left">55</td>
<td align="left">0.75<break></break>
(0.35, 1.62)</td>
<td align="left">0.46</td>
</tr>
</tbody>
</table>
<table-wrap-foot><fn id="tblfn0010"><label>a</label>
<p id="npar0010">Clearance of MERS-CoV rRT-PCR was calculated on patients who had at least one follow-up rRT-PCR test in the ICU from the date of ICU admission, and censored by the date of last test or death whichever comes first. For the cox proportional analysis: Event – cleared, Censored – not cleared – Discharged Alive, Palliative Discharge, Still In Hospital, Transferred To Other Facility.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</p>
</sec>
<sec id="sec0065"><title>MERS-CoV RNA clearance</title>
<p id="par0100">Cox proportional hazards model revealed that macrolide therapy was not associated with difference in MERS-CoV RNA clearance (adjusted HR: 0.88; 95% CI: 0.47–1.64; <italic>P</italic>
= 0.68). Similar results were revealed when this analysis was restricted to survivors (adjusted HR: 0.75; 95% CI: 0.35–1.62; <italic>P</italic>
= 0.46) (<xref rid="tbl0015" ref-type="table">Table 3</xref>
).</p>
</sec>
</sec>
</sec>
<sec id="sec0070"><title>Discussion</title>
<p id="par0105">This cohort study found no association between macrolide therapy and 90-day mortality or MERS-CoV RNA clearance among critically ill patients with MERS.</p>
<p id="par0110">Few studies have investigated the association between macrolide therapy and mortality in patients with influenza or respiratory viral infections (<xref rid="bib0040" ref-type="bibr">Hung et al., 2017</xref>
, <xref rid="bib0075" ref-type="bibr">Martin-Loeches et al., 2013</xref>
, <xref rid="bib0150" ref-type="bibr">Walkey and Wiener, 2012</xref>
). However, these results cannot necessarily be generalised to MERS. This study showed when adjusted for possible confounders using logistic regression analysis, macrolide therapy was not associated with a significant change in 90-day mortality. This may suggest that immunomodulatory effects of macrolides alone may not be effective on improving mortality rate in patients with MERS in the absence of effective antiviral drugs against MERS-CoV.</p>
<p id="par0115">Although macrolides are known to downregulate inflammatory responses and reduce the excessive cytokine secretions that are associated with respiratory viral infections (<xref rid="bib0005" ref-type="bibr">Amsden, 2005</xref>
, <xref rid="bib0020" ref-type="bibr">Beigelman et al., 2010</xref>
, <xref rid="bib0055" ref-type="bibr">Kanoh and Rubin, 2010</xref>
, <xref rid="bib0070" ref-type="bibr">Lendermon et al., 2017</xref>
, <xref rid="bib0160" ref-type="bibr">Zarogoulidis et al., 2012</xref>
), their direct effects on viral clearance in patients with respiratory viral infection are uncertain. An in vitro study on human bronchial epithelial cells showed that azithromycin significantly reduced rhinovirus replication and release (<xref rid="bib0030" ref-type="bibr">Gielen et al., 2010</xref>
, <xref rid="bib0115" ref-type="bibr">Schogler et al., 2015</xref>
). However, another study reported that azithromycin did not directly alter viral replication or clearance of parainfluenza type 1, Sendai Virus in mice (<xref rid="bib0020" ref-type="bibr">Beigelman et al., 2010</xref>
). Similarly, in an RCT, azithromycin therapy in infants with severe RSV bronchiolitis did not facilitate RSV clearance from the upper airway compared to placebo (<xref rid="bib0015" ref-type="bibr">Beigelman et al., 2015</xref>
). In an RCT, adults hospitalized for laboratory confirmed influenza were randomized to receive oseltamivir and azithromycin or oseltamivir alone, both for 5 days (<xref rid="bib0065" ref-type="bibr">Lee et al., 2017</xref>
). Pro-inflammatory cytokines declined faster in the oseltamivir-azithromycin group. However, viral RNA decline was not affected (<xref rid="bib0065" ref-type="bibr">Lee et al., 2017</xref>
). Our study is the first to have investigated the association between macrolide therapy and MERS-CoV RNA clearance. Our results showed that macrolide therapy had no significant association.</p>
<p id="par0120">Previous studies demonstrated improvement of symptoms of respiratory viruses including influenza patients who were treated with macrolides (<xref rid="bib0105" ref-type="bibr">Ninomiya et al., 2002</xref>
, <xref rid="bib0130" ref-type="bibr">Tahan et al., 2007</xref>
, <xref rid="bib0035" ref-type="bibr">Higashi et al., 2014</xref>
, <xref rid="bib0050" ref-type="bibr">Kakeya et al., 2014</xref>
). Due to the nature of the population in our study (critically ill patients), this study does not measure the difference in symptoms improvement between the group who received macrolides and the group who did not receive macrolides. Measuring the potential improvement of MERS-CoV symptoms after macrolides therapy may be considered in future studies.</p>
<p id="par0125">Our results should be interpreted in light of its strengths and weaknesses. This study is the first to examine the use of macrolide therapy in patients with MERS-CoV. It is derived from a collaborative, multicenter, observational database of critically ill patients with MERS-CoV, enhancing generalizability of our findings and mitigating the possibility of centre-related effect. This study also used an international standardised data collection tool. We adjusted for possible confounders including community-acquired infection, because of the probable association of this variable with both the exposure (macrolide therapy) and outcomes. Since macrolide therapy was initiated early during the ICU course, the risk of immortal time bias (survivorship bias) is probably limited. The main limitation is the retrospective nature of this observational study, and the potential that unmeasured confounders may influence the relationships we sought to examine. Also we did not measure cytokine levels or immune measures that might have been affected by macrolide administration.</p>
</sec>
<sec id="sec0075"><title>Conclusions</title>
<p id="par0130">In our study, more than one-third of critically ill patients with MERS-CoV received empiric therapy with macrolides. However, we found that macrolide therapy is not significantly associated with a reduction in 90-day mortality or improvement in MERS-CoV RNA clearance.</p>
</sec>
</body>
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<sec id="sec0100" sec-type="supplementary-material"><label>Appendix A</label>
<title>Supplementary data</title>
<p id="par0160">The following is Supplementary data to this article:<supplementary-material content-type="local-data" id="upi0005"><media xlink:href="mmc1.docx"></media>
</supplementary-material>
</p>
</sec>
<ack id="ack0005"><title>Acknowledgements</title>
<p>We would like to acknowledge the International Severe Acute Respiratory and Emerging Infection Consortium (ISARIC) for their support in the database.</p>
</ack>
<ack id="ack0010"><sec id="sec0080"><title>Funding</title>
<p id="par0140">There was no specific funding to this project, and data have been generated as part of the routine work of the participating organizations.</p>
</sec>
<sec id="sec0085"><title>Competing interests</title>
<p id="par0145">The authors declare that they have no competing interests. Dr Arabi is the principal investigator on the MIRACLE trial: MERS-CoV Infection tReated With A Combination of Lopinavir/Ritonavir and Interferon Beta-1b (ClinicalTrials.gov Identifier: NCT02845843). He and FGH are also nonpaid consultants on antivirals active for MERS for Gilead Sciences, SAB Biotherpautics and Regeneron.</p>
</sec>
<sec id="sec0090"><title>Ethical approval</title>
<p id="par0150">The study was approved by the institutional review boards of all participating centers. Patient-level informed consent was not required due to its observational nature.</p>
</sec>
</ack>
<fn-group><fn id="sec0095" fn-type="supplementary-material"><label>Appendix A</label>
<p id="par0155">Supplementary data associated with this article can be found, in the online version, at <ext-link ext-link-type="uri" xlink:href="https://doi.org/10.1016/j.ijid.2019.01.041" id="intr0005">https://doi.org/10.1016/j.ijid.2019.01.041</ext-link>
.</p>
</fn>
</fn-group>
</back>
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