From the National Institute of Allergy and Infectious Diseases (NIAID). Influenza virus in 1918 and today.
D004196:Disease Outbreaks / Q000266:history; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D007251:Influenza, Human / Q000266:history; D009975:Orthomyxoviridae / Q000235:genetics*