Hi. I'm sorry, I've got no real advice for you, just wanted to send some your way. My Natty just started CC a few weeks ago and we've all just been very sick with colds! I agree, it's not really about how clean the centre is, just that when kids get together the result is a sharing of germs, as other PPs have said.
I really hope Chompy gets better soon, and that the illnesses settle down. And that you can get back into your 'me' time at work again soon.