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That's what we're going to be seeing here relatively soon. >> reporter: for the vaccines this variant is now the most complete escapee, say researchers in the new preprint study, although vaccines are still highly effective at preventing severe disease or death. >> it is reassuring that these infections seem to be less severe. but that's really only true probably if you're a healthy person who's been immunized and ideally immunized with three shots. ♪ i am not throwing away my shot ♪ >> reporter: meanwhile, "hamilton" among the broadway shows canceling performances once more after cases am...

Answers. we begin with cnn's nick watt. >> reporter: covid-19 cases and hospitalizations climbed around 40% this past month. deaths, says the cdc, forecast to rise in the month ahead. the delta variant still rampant. omicron on the rise. >> it's here now, and it's spreading and it's going to increase. for unvaccinated we are looking at a winter of severe illness and death, unvaccinated. for themselves, their families, and hospitals they'll soon overwhelm. >> very soon it's going to be the dominant variant. we've seen that in south africa. we're seeing it in the uk. and i'm absolutely certain t...

Cnn learning the fda is expected to authorize covid vaccine booster shots for some immuno compromised people within the next 48 hours. that as a new study suggests the delta variant is hurting vaccine efficacy here in the u.s. although the vaccines still strongly protect people against severe disease, hospitalization and death. joining me now dr. peter hotez, a codirector of the texas children's hospital for vaccine development. good to see you, sir. thank you very much. this preprint study shows that vaccine efficacy is getting worse in july -- got worse in july. moderna's efficacy by the end...

Um, this preprint study shows that vaccine efficacy is getting worse, in july. got worse in july. moderna's efficacy, by the end of july, had fallen to 76%. pfizer's dropped to 42%. when you see this study, tell me what you think? what stands out to you? >> well, the most important piece of this, don, is the fact that still the protection against hospitalizations and deaths is, still -- is, still, there. so that's the single-most important component and -- and the one to keep in mind. if you actually look at the data, there's -- there is a bit of a dropoff in the last month with the pfizer vac...