Measles doesn't have 'safe harbours' in so many other animals. It's a human-only virus. Coronaviruses infect many other animals. Merely vaccinating all the huma

Measles doesn't have 'safe harbours' in so many other animals. It's a human-only virus. Coronaviruses infect many other animals. Merely vaccinating all the humans is tough (who's going to be doing it in all of the world's failed states?), now try vaccinating all the deer/minks/cats/dogs/bats.