Flu's worst season.
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Boyce
D005814:Genes, Viral; D049673:History, 20th Century; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology / Q000266:history* / Q000821:virology; D009975:Orthomyxoviridae / Q000235:genetics* / Q000472:pathogenicity; D014774:Virulence / Q000235:genetics