The tetanus vaccine is one of the oldest. Which is perhaps why people have forgotten about it--great efficacy. See https://en.wikipedia.org/wiki/Vaccine#Timeli

The tetanus vaccine is one of the oldest. Which is perhaps why people have forgotten about it--great efficacy. See https://en.wikipedia.org/wiki/Vaccine#Timeline https://en.wikipedia.org/wiki/Vaccine#Timeline https://en.wikipedia.org/wiki/Timeline_of_vaccines https://en.wikipedia.org/wiki/Timeline_of_vaccines