This is part of what I found on the subject of compulsory vaccination
for smallpox.
https://www.historyofvaccines.org/co...n-requirements

The court in Philadelphia in 1922 said that it was "within the police
power of a state to provide for compulsory vaccination."

https://www.npr.org/2011/04/05/13512...cination-rules

https://www.google.com/search?client...UDCAs&ua ct=5