What could possibly go wrong?
In the Isaac Asimov “Robot Series” of his novels, there were two groups of humans, the Earthers and the Spacers.
The Spacers had been away from earth for several generations and they decided to return to Earth. They had to live in bubble dome covered villages because the had lost all immunity to Earth diseases, having lived in perfectly clean and germ free Space.
The same thing will happen to US if we keen developing ways to kill germs and viruses before our immune systems can get a workout.
Once we eliminate all germs and viruses, we are vulnerable to any new bug that may appear................
It’s probably carcinogenic.