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CDC updates guidance, recommends vaccinated people wear masks indoors in certain areas AFP via Getty Images To prevent further spread of the Delta variant By Jacqueline Howard, CNN To prevent further spread of the Delta variant, the US Centers for Disease Control and Prevention updated its mask guidance on Tuesday to recommend that fully vaccinated people wear masks indoors when in areas with “substantial” and “high” transmission of Covid-19, which includes nearly two-thirds of all US counties. “In recent days I have seen new scientific data from recent outbreak investigations showing that the Delta variant behaves uniquely differently from past strains of the virus that cause Covid-19,” CDC Director Dr. Rochelle Walensky told a media briefing on Tuesday.

United statesChapel hillWhite houseDistrict of columbiaThe deltaGlades countyDavid weberElizabeth cohenJacqueline howardRochelle walenskySanjay guptaKaitlan collinsAmerican academy of pediatricsWarnermedia companyUs centers for diseaseSociety of healthcare epidemiology