The only way to contract a virus is to be around one. If you are not around them , you won`t get it.
I`ve had nothing that a little sleep wouldn`t fix.
Aha that's the thing, though. When I had pneumonia earlier this year the doc told me that I could have simply "breathed it in the air." I mean, you can't see it, so how can you avoid it? It can come from a cough on the street.