References 265% CONFIDENCEOverall confidence: 65%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]50%en.wikipedia.org/wiki/Spanish_fluen.wikipedia.org· Posted Sep 21, 2026· Starts Mar 4, 1918 ✓· 50% of score
4 March 1918 is the first recorded case at Camp Funston, which is the earliest documented outbreak rather than a proven origin - the pandemic's beginning is genuinely disputed.
- [2]85%The Deadly Virus: The Influenza Epidemic of 1918archives.gov· Added Sep 21, 2026· 50% of score
The National Archives' documentary record of the epidemic in the United States.
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