against this virus. so there are a lot of people out there who are still not vaccinated and we sure wish they would start rolling up their sleeves and joining the rest of us. >> reporter: is there a concern for the vaccinated? especially if the virus continues to spread, which could mean more variants and could these variants mup tate in a way they can figure out how to evade our vaccines? >> well, of course, that is the concern, whether this virus multiplies add border or at home. when it multiplies billions of times when is enters a body, it can mutate. every once in a while, fortunately, rarely, these new mutations can become variants that can compete with the parent strain, so that could happen. the way to tamp all of that down, of course, is for everyone to be vaccinated and not give the virus the opportunity to mutate. >> what do you think the chances