How do new variants like delta change things? Unvaccinated people are at a substantially higher risk of getting infected with and transmitting SARS-CoV-2, and of developing complications from COVID-19. The CDC further recommends masking in public for vaccinated people with unvaccinated household members, regardless of local community transmission rates. The recommendation that fully vaccinated people continue wearing masks is primarily intended to protect the unvaccinated – which includes kids under age 12 who are not yet eligible for vaccines in the U.S. Who’s actually protected by masking recommendations? Using these criteria, the CDC guidance applied to 63% of U.S. Los Angeles County, for example, far surpassed that mark in mid-July, with more than 10,000 coronavirus cases per week. By the CDC’s own definitions “substantial” community transmission is 50 to 99 cases of infection per 100,000 people per week, and “high” is 100 or more. with more than 50 new infections per 100,000 residents or that had more than 8% of tests come back positive during the previous week. The CDC mask recommendation targets areas in the U.S. Hence the CDC recommendation that vaccinated people remain masked in indoor public spaces to help stop viral transmission. If vaccinated people can get infected with the coronavirus, they can also spread it. 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. 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. This is particularly true with emerging variants of concern. 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. They’re a literal layer between you and any virus in the air and can help prevent infection. Masks help stop the spread of the coronavirus. What science supports masking after vaccination? 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. guidelines more in line with World Health Organization recommendations. 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. 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. Centers for Disease Control and Prevention. “This guidance acknowledges that the pandemic is not over but also helps us move to a point where COVID-19 no longer severely disrupts our daily lives,” Greta Massetti, Ph.D., MPH, and MMWR author, said in a statement.Vaccinated people need to mask up again, according to the U.S. The CDC also no longer recommends “test to stay,” which allowed children in close contact with someone COVID-19 positive to remain in class as long as they tested negative for the virus. The revised guidance is explained in a new Morbidity and Mortality Weekly Report (MMWR) and includes ending the recommendation that children in different classrooms avoid mixing, a practice called “cohorting.”
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