This is how I sign my emails these days to gently educate whoever I happen to be emailing. Just thought I'd mention it in case you like the idea.

— Bill

A mask might be appropriate if you're actively sneezing, coughing and infected but, otherwise, no.  See WHO Recommends against wearing a mask, or this, this, this, this or this for more.

It doesn't make much sense to vaccinate the entire species against a relatively standard respiratory virus, but that's just because you are still thinking critically.