EXACT VACCINE UNCERTAIN. “Some modern virologists believe that the vaccine used to immunize people throughout the 19th century was closer in form to smallpox than to cowpox; in other words, that vaccination was variolation by another name. The truth is that we just don’t know —and because no samples of the 19th century vaccine survive, we may never know.”
https://lnkd.in/eYNfQxg
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022