Meningococcal disease in Belgium. I. Risk of secondary cases among household contacts and evaluation of prophylaxis.
D000293:Adolescent; D000328:Adult; D001530:Belgium; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008585:Meningitis, Meningococcal / Q000235:genetics* / Q000517:prevention & control; D012306:Risk