National News

An employee and a customer both wear masks at a salon in Los Angeles, July 27, 2021. The CDC’s new masking advice was based in part on unpublished data showing that the virus can thrive in the airways of vaccinated people. (Alex Welsh/The New York Times)

An employee and a customer both wear masks at a salon in Los Angeles, July 27, 2021. The CDC’s new masking advice was based in part on unpublished data showing that the virus can thrive in the airways of vaccinated people. (Alex Welsh/The New York Times)