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Lasting February 1918 to April 1920, it infected 500 million people–about a third of the world's population at the time.

Last Updated: Jul 09 2020 16:23
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The Spanish Flu, also known as the 1918 Flu Pandemic, was an unusually deadly influenza pandemic caused by the H1N1 influenza A virus. Lasting February 1918 to April 1920, it infected 500 million people–about a third of the world's population at the time.