The Spanish Flu, 1918-1920.
The Spanish Flu (1918-1920) spread internationally in less than six months following the First World War. The earliest recorded outbreak was in the mid-western United States, and then quickly spread to Europe and beyond in three waves known as the ‘Spring Wave,’ the ‘Fall Wave,’ and then a third undefined wave. In the devastating Fall Wave, an estimated 24.7-39.3 million people died globally from symptoms such as severe fever, headache, sore throat, and body aches (“Calm, Cool, Courageous.”).