dominant strain in england. all right, now to michigan, where hospitals are overburdened with covid-19 patients. health officials say many of these patients aren't vaccinated. cnn's jason carroll visited one hospital to see how they're handling the case load. >> it's been a lot worse lately, but we do what we can. >> the hours at work for nurses like lisa maddox seem never-ending. >> unfortunately, i'm not a super hero, i'm just a nurse. >> reporter: mad ddox is a covi worth working on eighth north team, eighth floor, north tower at dearborn, michigan. she's worked here since she graduated from nursing school only haabout a year and a half ago. lately, the covid unit here is seeing more and more patients, all while there are fewer nurses to care for them. >> there have been days like, i don't know how much longer i can do this. and i'm brand-new. but at the same time, it's very rewarding what we do. >> reporter: the new wave of covid-19 is flooding michigan's