https://www.historyofvaccines.org/content/us-supreme-court-a...
The background was a polio outbreak in MA around 1905, with something like a 30% mortality among all age groups.
We are back to 1905, but now its not 30% that is at the issue, but some decimal to the right of zero.
https://www.historyofvaccines.org/content/us-supreme-court-a...