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CNN Newsroom With Jim Acosta-20211126-22:10:00

the past those kind of vaccine escape variants have not really translated into major global path os gens. we have seen this before, but with the beta variant, with the lambda variant, those never really took off. so there's nothing intrinsic in the spike protein that would account for global spread. the two worst ones, the alpha, that arose out of theuu uk, and the delta variant that rose out of an unvaccinated population in india, was because of amino acid substitution that caused it to be a much more highly transm transmissible. so the most important question for this weekend and next few days, next week is -- is this variant more transmissible than delta? does it have the ability to

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Detailed text transcripts for TV channel - MSNBC - 20210521:13:21:00

a booster now and said the science should be clear in a matter of months. >> all comes down to the science. sam brock in coral gables. happy friday to you, my friend. thank you for joining us. appreciate it. i now want to bring in former cdc director dr. tom frieden. great for seeing you. thank you very much for joining us on this friday. let's start there with what sam was talking about, mixed messages we are hearing right now. you have the ceos of pfizer and moderna who say we will likely need booster shots by the fall. you heard what dr. anthony fauci said. what are you seeing in the science? what does the science tell us? >> kristen, here's the bottom line. there are two reasons why we might need a booster shot. first, if variants emerge in what are called vaccine escape variants, so they can get around immunity which are vaccinations, which are amazingly effective at providing. secondly, if the vaccine-induced

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