OriginalTweet: @lawleanne042 @puppy_sand @ChrsAWhte @jaketapper All vaccines depend on other people getting the vaccine. That's what "herd immunity" means. Smallpox vaccine is about 95% effective - same as COVID-19 vaccine. Once the smallpox vax exceeded 80%, vitrually 0% of people caught Smallpox. We've barely reached 50% vax'd against COVID