Influenza activity in England and Wales.
D004196:Disease Outbreaks; D004739:England / Q000453:epidemiology; D006801:Humans; D009980:Influenza A virus / Q000145:classification / Q000302:isolation & purification*; D007251:Influenza, Human / Q000453:epidemiology*; D014852:Wales / Q000453:epidemiology