virus
Influenza, 1918–1919
The three waves of the 1918 H1N1 pandemic: mortality peaked sharply in the deadly autumn wave, a defining example of viral pandemic dynamics.
The data
| Wave | Excess mortality / 1,000 |
|---|---|
| Spring 1918 | 1.2 |
| Summer 1918 | 0.8 |
| Autumn 1918 | 7.4 |
| Winter 1919 | 3.1 |
| Spring 1919 | 1.6 |