The influenza pandemic of 1918-1919, also known as Spanish Flu, claimed the lives of 675,000 Americans and as many as 40 million people worldwide. The roll among U.S. servicemen during WW1 was especially severe. "Of the U.S. soldiers who died in Europe, half of them fell to the influenza virus and not to the enemy. An estimated 43,000 servicemen died of influenza." No part of America escaped this pandemic.