This is the premise of the film adaptation of I am Legend;

> The story is set in New York City after a virus, which was originally created to cure cancer, has wiped out most of mankind, leaving Neville as the last human in New York, other than nocturnal mutants.

https://en.wikipedia.org/wiki/I_Am_Legend_(film)

Mostly, Just Another Generic Zombie Film, though.

The book is superior in every way.

The Omega Man is also a much better film adaptation than the Will Smith effort. Killer soundtrack too: https://en.wikipedia.org/wiki/The_Omega_Man

"Horrible virus used to cure xxx disease ends up destroying humanity" is becoming a common trope in fiction. Rise of the Planet of the Apes, The Passage, etc.

Fiction hasn't been accurate at predicting good things in the future, but it sure has been spot on when predicting the bad stuff. It feels like we're living in one of those frustrating horror films where the protagonists ignore obvious warning signs and put themselves in the worst possible situations.

Generic after when zombies turned into speed demons.

the book was so much better.

The alternative ending to the film significantly improves it. You can easily find it online. (I'm not going to spoil it.)

The directors cut? That was a wild ending

Wow

I'm dubious about modifying a virus to escape our immune system - seems like that could come around to bite us in the ass. But they basically identified a receptor unique to cancer cells and what's different about binding to it vs binding to the similar version in healthy cells. Seems like a great drug target. You could even probably make a drug that binds to it and triggers an immune response, get the immune system on side. I'm not an expert in the field by any means, but I'd rather see that than a super virus.