From first hand experience with these bugs being brought across the border, trust me you don’t want one of their stomach bugs, grocery store shopping carts are some of the worst for spreading them. People are going to start wearing gloves whenever they go out again. It was still standard for "ladies" and "gentlemen" in this country until WWII. My grandmother used to talk about hydrophobia and diptheria. I think it was the European plagues that brought on that custom of year-round glove-wearing in the first place.
Not only gloves but face masks are also going to become popular I believe.
Let the people in the crowded cities pile into a crowded elevators, subways, buses etc. with an illegal that’s got TB and hacking his lungs up.
Let’s find out how tolerant they are.