title: Letter: Recognition of diphtheria.
mesh_terms: D004196:Disease Outbreaks; D006801:Humans; D008585:Meningitis, Meningococcal / Q000382:microbiology / Q000517:prevention & control; D009345:Neisseria meningitidis / Q000302:isolation & purification*; D009549:Nigeria; D012703:Serotyping