Thread, nine tweets.

Polio is asymptomatic in 70% of cases. In the remaining 30%, it presents with no central nervous system symptoms outside of 0.5% of cases.

In the 1952 polio outbreak in the US, there were 58,000 cases, 3,145 deaths.

The US responded with horror and tried to eradicate it.

— Anosognosiogenesis (@pookleblinky) May 21, 2021