"Almost no virus is protective against allergic disease or other immune diseases. In fact, infections with viruses mostly either contribute to the development of those diseases or worsen them. "The opposite is true of bacteria. There are good bacteria and there are bad bacteria."

Is the Hygiene Hypothesis True? | Johns Hopkins Bloomberg School of Public Health

The hygiene hypothesis says exposure to germs helps kids develop healthy immune systems. But many viruses didn’t circulate as widely during the pandemic. Are there downsides to missed infections?

I was reminded of this article I read some time ago when I read your post. Most viruses are not pathogenic. The human virome has 380 trillion! www.bbc.com/future/artic...