Spanish flu outdid WWI in number of lives claimed.
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Wilton
D002170:Canada; D004196:Disease Outbreaks / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology / Q000266:history*; D009026:Mortality; D013030:Spain; D014481:United States; D014857:Warfare