Meningococcal infections.
D000293:Adolescent; D000328:Adult; D002648:Child; D004196:Disease Outbreaks / Q000453:epidemiology*; D005060:Europe; D005260:Female; D006801:Humans; D008297:Male; D008589:Meningococcal Infections / Q000453:epidemiology*; D006113:United Kingdom