'The wheel within a wheel': meningococcal trends.
D006801:Humans; D008585:Meningitis, Meningococcal / Q000453:epidemiology; D008589:Meningococcal Infections / Q000453:epidemiology*; D009345:Neisseria meningitidis / Q000145:classification; D009519:New York City; D018805:Sepsis / Q000453:epidemiology*; D012703:Serotyping; D014481:United States