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This fact brief was originally published as an experiment to test the concepts behind fact briefs.
Readers should be aware that while there is still a lot of useful information in fact briefs like this one, not all of them reflect Gigafact's current methods and standards for fact briefs. If you come across any that you feel are out of date, don't hesitate to contact us at support@gigafact.org.
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FACT BRIEF

Was the CDC’s latest change in masking guidance based solely on a faulty study from India?

By Stevie Rosignol-Cortez
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NO

The latest adjustment in Centers for Disease Control advice about masking was based on “new science” about the delta variant of the coronavirus, CDC Director Rochelle Walensky said in a TV interview. An updated CDC document cites research from the U.S. and Israel into “breakthrough” delta infections of fully vaccinated people, as well as a study from India of patients protected by a vaccine not being used in the U.S.

“These early data suggest that breakthrough delta infections are transmissible,” the CDC says. The infections don't necessarily lead to higher risk of serious disease for the vaccinated, but the variant may be more readily transmissible to unvaccinated or immunosuppressed people they may encounter. That concern led the agency to advise that vaccinated people in areas experiencing generally high rates of infections should wear masks indoors.

This fact brief is responsive to conversations such as this one.
Sources
ABC News CDC director addresses changing mask guidance
Centers for Disease Control Science Brief: COVID-19 vaccines and vaccination
Centers for Disease Control Interim public health recommendations for fully vaccinated people
Centers for Disease Control SARS-CoV-2 variant classifications and definitions
Stat CDC recommends masks indoors for some vaccinated against Covid-19
ABOUT THE CONTRIBUTOR
Gigafact
Between 2020 and 2022, under close editorial supervision, Gigafact contracted a group of freelance writers and editors to test the concepts for fact briefs and provide inputs to our software development process. We call this effort Gigafact Foundry. Over the course of these two years, Gigafact Foundry writers published over 1500 fact briefs in response to claims they found online. Their important work forms the basis of Gigafact formats and editorial guidelines, and is available to the public on Gigafact.org. Readers should be aware that while there is still a lot of relevant information to be found, not all fact briefs produced by Gigafact Foundry reflect Gigafact's current methods and standards for fact briefs. If you come across any that you feel are out of date and need to be looked at with fresh eyes, don't hesitate to contact us at support@gigafact.org.
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About fact briefs published on Gigafact
Fact briefs are short, credibly sourced summaries that offer “yes/no” answers in response to claims found online. They rely on publicly available, often primary source data and documents. Fact briefs are created by contributors to Gigafact —a nonprofit project looking to expand participation in fact-checking and protect the democratic process. See all fact briefs here.