The Centers for Disease Control and Prevention (CDC) today strengthened mask recommendations once again, suggesting even vaccinated people in areas seeing high virus activity should resume wearing masks indoors.Also, all schoolchildren, staff, and teachers should now wear masks when indoors, regardless of vaccination status, when the 2021-22 school year begins next month, the agency said.The about-face comes 2 months after the agency said fully vaccinated Americans could ditch their masks and return to normal.
But new data on breakthrough infections in vaccinated Americans caused by the Delta (B1617.2) variant shows in rare cases, vaccinated people can transmit the virus, necessitating mask use in some instances."We have always said our