- Outbreaks of flu-like illness are first detected in the United States.
- More than 100 soldiers at Camp Funston in Fort Riley, Kansas become ill with flu. Within a week the number of flu cases quintuples.
- Sporadic flu activity spreads unevenly through the United States, Europe, and possibly Asia over the next six months.
April 1918
First mention of influenza appears in an April 5 weekly public health report. The report informs officials of 18 severe cases and three deaths in Haskell, Kansas.
May 1918
By May, hundreds of thousands of soldiers travel across the Atlantic each month as they are deployed for World War I.
September 1918
- The second wave of flu emerges at Camp Devens, a United States Army training camp just outside of Boston, and at a naval facility in Boston.
- Between September and November, a second wave of flu peaks in the United States. This second wave is highly fatal, and responsible for most of the deaths attributed to the pandemic.
- New York City’s Board of Health adds flu to the list of reportable diseases, and requires all flu cases to be isolated at home or in a city hospital.
- By the end of September, more than 14,000 flu cases are reported at Camp Devens—equaling about one-quarter of the total camp, resulting in 757 deaths.
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