Meningococcal disease--Canada, 1991.
D000293:Adolescent; D002170:Canada / Q000453:epidemiology; D002648:Child; D003430:Cross-Sectional Studies; D004196:Disease Outbreaks; D006801:Humans; D015994:Incidence; D008585:Meningitis, Meningococcal / Q000453:epidemiology* / Q000517:prevention & control; D008589:Meningococcal Infections / Q000453:epidemiology* / Q000517:prevention & control; D009345:Neisseria meningitidis