Read US death rates by cause 1910 to 1938 and tested sleepy sickness against flu
The 1943 Census volume prints its tables sideways and the scan text is garbled, so the influenza and encephalitis rows were read from rotated page images. Encephalitis did not rise in 1918; it peaked in 1920 and 1923. No one-year lag behind flu; a modest, patchy same-year link.
How it connects
This step led us to
US death rates 1910 to 1938: encephalitis did not rise in 1918; it peaked in 1920 and 1923
This step led us to
Sleepy sickness follows flu waves by about a year (Ravenholt and Foege)
This step led us to
Sleepy sickness and flu rise in the same years
This step is about
What caused encephalitis lethargica, the 'sleepy sickness' of 1917 to 1928?
This step and then
Tested sleepy sickness against flu in England and Wales
This step came after
Checked whether Europe could see the 1054 supernova