The globe wasn't designed, and those animals didn't choose immunity. It was developed via evolution. And evolution will similarly wipe out massive numbers of species due to global exposure of pathogens. We are in the midst of the greatest extinction event this world has ever seen. Keep your head down and may the antigens be in your favor.
That's my point. Evolution was a long, slow, and often isolated process. When you begin to jet things from one side of the planet to the other you're doing things that are entirely atypical of evolution.
The point being, any species that developed and survived via evolution is unfit for speed and breadth of the current human + technology modern version of "evolution".
