Important question: Has the wizarding world discovered vaccines and is Hogwarts vaccinated?
Circa Seventh Book
Hermione: Has the wizarding world discovered vaccines?
Ron: A wax what?
Hermione: hmmmm
Harry: Hermione, we cant take out the death eaters with a genetically magicked disease
Hermione: No I know that. Of course I know that.
*Uncomfortably long silence*
Harry: What if we gave them all smallpox
Hermione: HARRY NO! We already eradicated it once, let's not make the world do it again
Harry: Oh yeah, I guess you're right
Hermione: Now tuberculosis, on the other hand...
Hermione: If Voldemort likes the good ole' days so much, why don't we bring them back? Old society, old war tricks
Hermione, putting on a gas mask: New plan. We take them out with consumption and mustard gas
Hermione, to Voldemort: Did you know, historically, a majority of war deaths come from disease?
Harry Potter and the Violation of the Geneva Convention
to be fair, nobody asked the wizards to sign it.
Harry: We didn’t have time to do a proper Unbreakable Vow, so Hermione and I just made a pinky-swear to never tell anyone about how we crossed tuberculosis with the common cold.
Dean: ...Why would you do that?
Hermione, smiling placidly: We didn’t. That would be a terrible, terrible thing.
