[1] Minist Hlth, Global Ctr Mass Gatherings Med, Riyadh 11176, Saudi Arabia
[2] UCL, Div Infect & Immun, London, England
[3] UCL Hosp NHS Fdn Trust, London, England
[4] Saudi Aramco, Saudi Aramco Med Serv Org, Dhahran, Saudi Arabia
[5] Indiana Univ Sch Med, Indianapolis, IN 46202 USA
[6] Univ Bonn, Med Ctr, Inst Virol, D-53127 Bonn, Germany
[7] Minist Hlth, Saudi CDC, Riyadh 11176, Saudi Arabia
[8] Aarhus Univ Hosp, Dept Infect Dis, Inst Clin Med, Aarhus, Denmark
[9] Aarhus Univ Hosp, Dept Clin Microbiol, Aarhus, Denmark