Influenza Pandemics of the 20th Century
- 1918 Spanish Flu: Killed more than 500,000 people in the U.S., and 20 million to 50 million people worldwide.
- 1957 Asian Flu: Killed roughly 70,000 people in the U.S.
- 1968 Hong Kong Flu: First detected in Hong Kong, this virus caused roughly 34,000 deaths in the U.S.