Case definitions. Meningococcal disease.
D002675:Child, Preschool; D004196:Disease Outbreaks / Q000517:prevention & control; D006801:Humans; D008585:Meningitis, Meningococcal / Q000453:epidemiology / Q000517:prevention & control; D008589:Meningococcal Infections / Q000453:epidemiology / Q000517:prevention & control*