In 1918-1919, the worst flu in recorded history killed an estimated 50 million people worldwide. The U.S. death toll was 675,000 - five times the number of U.S. soldiers killed in World War I. Where did the 1918 flu come from? Why was it so lethal? What did we learn?

http://www.Flu.gov/weheardthebells

Pandemic and seasonal flu information found at http://www.Flu.gov

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