They stopped vaccinating against smallpox in 1972[1]. It was administered around 12 months of age before then. So anyone in the US born in 1972 or later is most

They stopped vaccinating against smallpox in 1972[1]. It was administered around 12 months of age before then. So anyone in the US born in 1972 or later is most likely unvaccinated. [1] https://www.cdc.gov/smallpox/vaccine-basics/index.html https://www.cdc.gov/smallpox/vaccine-basics/index.html [2] https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-details/smallpox-vaccine https://www.chop.edu/centers-programs/vaccine-education-cent...