[lizma2]

" those who have been vaccinated against tetanus, snake venom, gas vesicles, and botulism are not allowed to donate blood for 3 months after administration."

Knew a women who after a recently diagnosis of breast cancer was bit by a copperhead while gardening. Cured her cancer.

Never knew there was a vaccine for snake bites.

[grey_whiskers]

Sloppy writing is my guess. Anti-venom, most likely.
https://en.wikipedia.org/wiki/Snake_antivenom