[whyenot]

Unless you are sterilizing everything entering the cleanroom, that is simply not possible. Fungal spores, bacteria, and viruses are everywhere. If one of your workers is a smoker, they can spread Tobacco Mosaic Virus, for example.

[glibgil]

Yep, that's what a cleanroom is. I know what words mean, thanks http://imgur.com/EYm8jyn

[greglindahl]

Clean rooms are not perfectly clean. I've always wondered if Intel, which is famous for wanting all of their fab cleanrooms to be the same, also infects them with the same bacteria and mites...

[glibgil]

> Clean rooms are not perfectly clean

Yeah, but they are still clean and known as cleanrooms. I know about microbes, thanks