[Mr. Rabbit]

There’s nothing surprising about this. The first vaccine was called a “vaccine” because Edward Jenner noticed that milkmaids who got the relatively mild cowpox seemed to not be dying from smallpox. So he tried infecting people with cowpox to prevent dying of smallpox and it worked.

[takebackaustin]

That’s a fun thing to learn, but you are expecting a lot of linguistic insight of the average reader saying “that’s why they call it a vaccine.” If I may help put it more accessibly, thats why the Latin root word for vaccine is the same as the root word for Spanish vaca “cow”.

Maybe you have to be a Texan but it seems like everybody knows that.