Influenza under close surveillance.
D004196:Disease Outbreaks / Q000517:prevention & control* / Q000706:statistics & numerical data*; D005060:Europe / Q000453:epidemiology; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology*; D008270:Madagascar / Q000453:epidemiology; D009975:Orthomyxoviridae / Q000145:classification / Q000302:isolation & purification; D011159:Population Surveillance / Q000379:methods; D013045:Species Specificity