Meningococcal disease due to group A Neisseria meningitidis in contacts of Mecca pilgrims.
D000293:Adolescent; D000328:Adult; D002675:Child, Preschool; D005260:Female; D005602:France; D006801:Humans; D007223:Infant; D008297:Male; D008589:Meningococcal Infections / Q000635:transmission*; D009345:Neisseria meningitidis / Q000302:isolation & purification; D012067:Religion; D012529:Saudi Arabia; D014195:Travel