Limiting the effects of influenza epidemics.
D000368:Aged; D004196:Disease Outbreaks / Q000453:epidemiology / Q000517:prevention & control*; D005060:Europe; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049691:History, Medieval; D006801:Humans; D007252:Influenza Vaccines; D007251:Influenza, Human / Q000453:epidemiology / Q000266:history / Q000382:microbiology / Q000517:prevention & control*; D009975:Orthomyxoviridae / Q000276:immunology
D007252:Influenza Vaccines