> Cat's themselves are not very sanitary. Better than rats, sure, but they are a source of toxoplasmosis

Hyperbole and toxoplasmosis go well together.

In particular: it's a limited time window when an infected feline could transmit toxoplasmosis. It can be dangerous to pregnancies, or immuno-compromised individuals.

Most humans (and other beings) aren't pregnant or immunocompromised, but the drama of the topic gets clicks, so it's a meme of sorts, and it resurfaces every six months or so in the news as if a revelation.