performers were practicing in a group after more than a year of training alone. >> i feel sketched out about being out here, but, yeah, i can't stay at home all the time. >> reporter: health experts worry about what happens when hot weather drives people indoors this summer, especially in some states where vaccination rates are lower. >> i'd still wear a mask at work just because i work with the public. even though i'm fully vaccinated, i don't know if they are or not. i feel like it's still good -- >> your whole store got hit. >> my whole work caught it back in december. that was great. it was a terrible experience having it. >> reporter: he's not able to ask customers if they've been vaccinated. even with an honor system that's fool proof, there's a sense the country has turned a corner. >> it's like a hopeful moment and a year -- the past couple of years it's been a lot of really bad news. >> reporter: in other hopeful news, public health england show