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MASKS17 Aug 2021 21:37
Why the CDC recommends wearing masks indoors even if you’ve been fully vaccinated against COVID-19
Health Aug 2, 2021 1:10 PM EDT
Vaccinated people need to mask up again, according to the U.S. Centers for Disease Control and Prevention. On July 27, 2021, the CDC recommended that everyone in areas with high COVID-19 infection rates wear masks in public indoor spaces, regardless of vaccination status.
It’s a reversal from the CDC’s May 2021 advice that the fully vaccinated could leave their masks at home and brought U.S. guidelines more in line with World Health Organization recommendations.
The Conversation asked Peter Chin-Hong, a physician who specializes in infectious diseases at the University of California, San Francisco, to help put into context the science behind the changing messages.
What science supports masking after vaccination?
Masks help stop the spread of the coronavirus. They’re a literal layer between you and any virus in the air and can help prevent infection.
The reason public health officials are calling for more mask-wearing is that there is clear and mounting evidence that – though rare – breakthrough COVID-19 infections can occur in people who are fully vaccinated. This is particularly true with emerging variants of concern. The good news is that COVID-19 infection, if it does happen, is much less likely to lead to serious illness or death in vaccinated people.
Some conditions make a breakthrough infection more likely in a vaccinated person: more virus circulating in the community, lower vaccination rates and more highly transmissible variants.
If vaccinated people can get infected with the coronavirus, they can also spread it. Hence the CDC recommendation that vaccinated people remain masked in indoor public spaces to help stop viral transmission.
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