And then there was the time Rowling proudly declared that werewolves are a metaphor for AIDS. As she explained on Pottermore:
Lupin's condition of lycanthropy (being a werewolf) was a metaphor for those illnesses that carry a stigma, like HIV and AIDS. All kinds of superstitions seem to surround blood-borne conditions, probably due to taboos surrounding blood itself. The wizarding community is as prone to hysteria and prejudice as the Muggle one, and the character of Lupin gave me a chance to examine those attitudes.
If you've never dated a goth, werewolves are people who turn into violent beast-human monstrosities during the full moon, then stalk the lands attacking anything with a pulse. Sound like any AIDS victim you know? And the insulting comparisons don't stop there. One of the only two named werewolves in the Potter canon, Fenrir Greyback, is an evil creep who purposefully preys on children to "convert" them. Is that also part of the metaphor for an epidemic mostly blamed on gay men?
Or what about the fact that there's a treatment for lycanthropy, while in the '90s (the decade the Potter books are set in), AIDS was still mainly a slow and painful death sentence? Maybe stick to figuring out wizard poop. At least that's only harming the incontinent. And hygienic wizards.