tom balcezak. >> we've seen a 70% reduction in those over the age of 55 being admitted to the hospital, but what that means is we're seeing a lot more 30 and 40-year-olds coming in. just last week we intubated a 21-year-old. that's really unheard of for us. >> reporter: how alarming is that? >> well, it's pretty concerning. i think the message is nobody is completely safe unless you're vaccinated. >> reporter: just 20% of adults over 18 are fully vaccinated. despite that lack of broad protection, states are relaxing rules on masks and gatherings, giving more contagious variants opportunities to spread, says dr. ashish jah. >> our best estimate right now is probably 50% to 70% of all infections in america are from b.1.1.7., the variant from the uk. the issue is unvnvaccinated peoe getting together and given the variants, it's still risky. i would avoid it. everybody who wants a a vaccine will have had one, and certainly by the time we get into the summer. so my key advice is hold on tight a little bit longer. we're not talking about months. we're talking about a few more weeks. >> repor