CDC says fully vaccinated teachers and students don't need to wear masks indoors in updated guidance

The Centers for Disease Control and Prevention updated its public health guidance for schools Friday, saying fully vaccinated teachers and students don't need to wear masks inside school buildings.

The CDC's new guidance comes about two months after federal health officials permitted the use of the Pfizer-BioNTech Covid vaccine for kids ages 12 to 15, allowing middle and high school students to get the shots ahead of the fall school semester.

Teachers and students who are not vaccinated should still continue to wear masks indoors, the U.S. agency said, adding the practice is especially important when inside and in crowded settings, when social distancing cannot be maintained.

The agency also said it still recommends that students remain at least 3 feet apart in classrooms, combined with indoor mask wearing by people who are not fully vaccinated, to reduce the risk of transmission of the virus.

"When it is not possible to maintain a physical distance of at least 3 feet, such as when schools cannot fully re-open while maintaining these distances, it is especially important to layer multiple other prevention strategies, such as indoor masking," the CDC wrote in its guidance.

The CDC's recommendation will likely have no impact on students under 12, who are currently ineligible to get a Covid vaccine in the U.S.

The updated guidance comes as several states across the U.S. have largely done away with their mask requirements, social distancing and other pandemic-related restrictions because the Covid vaccines have helped drive down the number of new infections and deaths.

In mid-May, the CDC said fully vaccinated people didn't need to wear masks in most settings, whether indoors or outdoors. They are still expected to wear masks on public transportation, the agency said, such as on airplanes, buses and trains. The federal government's mask mandate on public transportation is scheduled to expire on Sept. 13 unless the CDC extends it once again.

The guidance may be controversial as scientists and other health experts say indoor mask mandates many make a return this fall, particularly in low vaccinated states, as the highly transmissible delta variant spreads across the U.S.

Already the dominant variant in the U.S., delta will hit the states with the lowest vaccination rates the hardest — unless those states and businesses reintroduce mask rules, capacity limits and other public health measures that they've largely rolled back in recent months, experts say.

This is a developing story. Please check back for updates.

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