feline parvovirus

A deadly feline disease is now spreading between cats after hiding in nature for nearly 40 years. Multiple cases of feline parvovirus, also known as cat plague, or panleukopenia, have been reported in stray kittens in the greater Melbourne area

full article:
https://www.newsweek.com/woman-spent-19000-cats-kidney-transplant-and-then-adopted-his-donor-834865