Emetophobia and starting nursery

So my 11mo is starting nursery on Monday and I know that he’ll bring home every bug known to mankind. The problem is that I have emetophobia and the idea of him bringing home sickness bugs is really causing me a lot of anxiety right now. We’ve already caught multiple colds off him but the stomach bugs a just causing this pit of dread in my stomach.

How did you other emetophobes cope? I need tips.