This sign in the Philidelphia Navy Yard urges workers to take health precautions during the peak of the flu pandemic which struck the United States in the fall of 1918. More than 675,000 Americans died from the diease. Around the clock war production, patriotic gatherings, and the creation of Army camps of 10,000 or more Soldiers spread the virus. ( National Archive)

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Photo credit: © Barney Low / Alamy / Afripics
License: Licensed
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