A virus hitches a ride
Armies on the move crammed into camps and ships with poor sanitation. The war’s mass movement was a major factor in the deadly Spanish flu.World War I: How War Supercharged a Pandemic
The toll
Spanish flu killed at least 17–25 million people, including about 675,000 Americans and 2.64 million Europeans.World War I: How War Supercharged a Pandemic
