You still eat fresh fruits and vegetables, touch the surfaces on your way to work etc. There’re countless pathogens everywhere. So I guess we would be fine?

You’re right that our immune system didn’t evolve to be in a sterile environment. But we also weren’t meant to be that close to that many humans.

>So I guess we would be fine?

Can you catch airborne respiratory diseases from eating fruit?

What I'm saying is: we run the risk of never being able to go outside again if we eliminate all airborne pathogens.

Are you suggesting that bringing more air from outdoors into our indoors environments will cause us to lose our ability to tolerate outdoors air?

Not to worry, people will still have children, and I assure you, they'll still go out into the world and lick the doorknobs/each other and get you sick so you can bring it to work.

> Can you catch airborne respiratory diseases from eating fruit?

I'm willing to speculate that exposing our immune system to surface pathogens helps deal with airborne pathogens.