rabies doesn’t mutate into new variants. Apples and oranges
Not according to The Phaser! LOL
https://thephaser.com/2021/09/doomsday-virus-discovery-of-rabies-mutation-might-end-humanity/
I think Fury’s point is that natural immunity is not better than vaccination for all diseases.
Rabies is the perfect example, as is Tetanus. Vaccine induced immunity is obviously better than being dead.