1919–1930 encephalitis lethargica epidemic
The encephalitis lethargica epidemic lasted from around 1918 to 1930. The cause is still unknown. Though the cause was once attributed to the coinciding Spanish flu epidemic, modern research has disputed this claim. The mortality was as high as 20%
Title page of Encephalitis Lethargica, Economo, 1931 | |
| Deaths | 20% mortality |
|---|---|
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