Watch how the influenza pandemic spread across the city of Philadelphia.
Each dot represents an individual death. The graph shows daily pandemic deaths.
Use the filters to refine the data shown on the map and graph.
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Before the pandemic, daily deaths in Philadelphia were counted in the dozens, not hundreds.
For a week in October 1918, the death rate from the pandemic was ten times higher than normal, with 600 to 850 people dying every day.
Over six months, influenza and related infections sickened a quarter of the population.
For every 28 people with influenza, one person died.