I think the mask wearing and social distancing will likely continue for quite a while even after the mass vaccination starts. Logistically, it's going to be a huge undertaking and not something that will be completed in a matter of days, or even weeks. So I think the risks of not having the vaccine straight away, but subsequently catching or transmitting the virus are going to be roughly what they are at present, if not a bit less... unless, of course, people start throwing caution to the wind, in the premature belief the crisis is over. Which I can well see happening.