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Reversing earlier guidance, the agency is encouraging indoor masking for fully vaccinated people under certain circumstances.
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Several governors have recently banned mask requirements in schools. But a new CDC study shows COVID-19 spreads less in schools where teachers and staff wear masks.
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Fully vaccinated people got the green light last week to resume much of their lives without masks. Behavioral experts say that as an incentive to get more people vaccinated, it's far from a sure bet.
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The Centers for Disease Control and Prevention says vaccinated people still must follow existing state, local or tribal laws on masks and social distancing.
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Biden says, "Today is a great day for America and our long battle with coronavirus. ... It's been made possible by the extraordinary success we've had in vaccinating so many Americans so quickly."
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But the CDC is urging all people — vaccinated or not — to continue avoiding medium or large gatherings since it's still learning how well the vaccines work to curb the spread of the virus.
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Unless people are packed together, "there really just is not much spread happening outdoors," Dr. Ashish Jha of Brown University's School of Public Health says.
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Hospitalizations are down 62% for childhood respiratory illnesses, a study shows. Masking and physical distancing are keeping a variety of viruses in check, but will these behaviors last?
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Officials said Wednesday that the masks will be delivered in the coming months, and are expected to reach an estimated 12 to 15 million vulnerable Americans.
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New research found that wearing a cloth mask over a medical mask significantly boosts protection against droplets that can transmit the virus. Knotting the ear loops of surgical masks also helps.