Up to a third of schoolchildren in some parts of England may already have had swine flu.
Gulland
Anne
A
D002648:Child; D004196:Disease Outbreaks / Q000706:statistics & numerical data*; D004739:England / Q000453:epidemiology; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*