title: Whooping cough in Hertfordshire.
mesh_terms: D002675:Child, Preschool; D004196:Disease Outbreaks / Q000453:epidemiology*; D004739:England; D006801:Humans; D014611:Vaccination / Q000600:supply & distribution; D014917:Whooping Cough / Q000453:epidemiology* / Q000517:prevention & control