title: Mass gatherings: implications and opportunities for global health security.
mesh_terms: D003142:Communication; D003441:Crowding; D018562:Disease Transmission, Infectious / Q000517:prevention & control*; D004632:Emergency Medical Services / Q000458:organization & administration; D006801:Humans; D008399:Mass Behavior; D011634:Public Health; D012308:Risk Management / Q000379:methods / Q000458:organization & administration*; D057236:Travel Medicine; D014944:World Health Organization