IMMUNIZATION SOURCE. “Whereas vaccination involved the use of a cowpox vaccine extracted from infected humans with cowpox, the older method of variolation used live smallpox virus, extracted from a human pustule, requiring two week isolation due to infectivity risk (which was often not possible).”
https://lnkd.in/eYNfQxg
linkedin post 2022-06-29 05:12:48
Nigel Fleming
September 21, 2022