>> my oxygen numbers were down, in the upper 60s, low 70s. >> reporter: oh, dear, that's very low. >> yeah. >> reporter: what does it feel like? >> it feels like a wreck. >> reporter: unvaccinated. this is the 66-year-old's second bout of covid-19. whatever natural immunity he had. >> it's my second round of this is way worse. >> reporter: and this is worse than the first? >> the first one was bad. >> reporter: it didn't help. his message now -- >> would you encourage others to get vaccinated now, though? >> yes. >> reporter: how important it is? how bad is covid? >> it's terrible. you don't want it. >> reporter: still, there are those like 62-year-old deborah laroche, in the covid unit for a week now who says vaccination just isn't for her. >> i didn't want to be vaccinated. >> you did not want to be vaccinated? >> no. >> reporter: you think you'll get vaccinated after this? >> no. >> reporter: why?