Mass gathering: mass effect?
Dixon
Bernard
B
D003140:Communicable Disease Control / Q000379:methods; D004196:Disease Outbreaks; D018562:Disease Transmission, Infectious; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000472:pathogenicity*; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology*; D008399:Mass Behavior; D008877:Middle East / Q000453:epidemiology; D012067:Religion