Epidemic group A meningococcal disease in Haj pilgrims.
D000328:Adult; D004196:Disease Outbreaks; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008585:Meningitis, Meningococcal / Q000453:epidemiology*; D011780:Qatar; D012529:Saudi Arabia; D014195:Travel