announcer: this is nbc nightly news with lester holt good evening. i m peter alexander in for lester we begin tonight with two major headlines in the fight to combat covid. the cdc releasing new guidance for schools, urging them to fully reopen this fall for in-person learning, saying those who are vaccinated do not need masks, and those who are not should wear them after the ne we told you about last night, ththat pfizer is developing a booster shot to target the delta variant, the fda and cdc now say those who are fully vaccinated do not need a booster. i just asked dr. anthony fauci about all of it. we will have that in a moment but we begin with late-breaking details from miguel almaguer. how you doing reporter: when fully vaccinated students and teachers return to the classroom, they won t need a face mask, says the cdc. the new guidance, which several states stopped enforcing weeks ago now mirrors the same guidelines for inoculated adults. but vaccines are not
I just spoke with dr. anthony fauci about schools and that debate over boosters but i started off asking him whether every school should be opening its doors for full-time in-person learning this fall the answer to that is an absolute yes we want to get chilen back in school in person across the board as we enter into the fall term. you said this week that vaccines currently work against the delta variant, but pfizer says that it is producing a vaccine booster that would target it specifically do americans really need a booster right now, they don t. we feel that ultimately at some point, we may need a boost as the durability of the response wanes but we don t know that right now and we don t know when that will be but we are certainly in the process of trying to find out 67% of american adults to this point have now received at least one shot but that means after a months long push. a third of american adults have so far decided not to get a
Yet available for children under 12, meaning roughly 28 million school-aged kids should still wear a mask and take preventative measures. it can be difficult for a school to either document the vaccine status of their students, teachers and staff. so in that situation, they might decide to do universal polics. the cdc s agency guidance comes as it also calls for all schools to fully reopen and also weighs in on the battle over boosters have you pull up your shirt reporter: after pfizer said its vaccine efficacy shows a decline after six months, and that americans would get added protection from a third shot, both the cdc and fda say there e is no scntific evidence a booster is needed yet across the board, it is clear. even with the delta variant, vaccine effectiveness against severe disease and hospitalization is very high after two doses. reporter: still, with pfizer moving forward. getting many americans
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