

cows don’t stop existing just because we don’t eat beef.
Humans need to go close to the infected animal to get infected.
being around/eating animals all the time also builds up your immune system’s defenses against diseases that originate in those animals
Oh, so being exposed to new viruses reduces the risk of dying to a virus you got … because you were exposed to it?
Don’t go near animals. Boil water before drinking. Simple as.
Vaccines work using either diluted toxins, or increasingly, proteins / RNA that just look somewhat like the real thing. The immune system works by enough of the population dying off until only those with the necessary mutations are left.