CDC Director Dr. Rochelle Walensky announced that the agency now recommends that people in areas with "high" or "substantial" Covid-19 transmission should resume wearing masks indoors. Nearly two-thirds of US counties have high or substantial transmission of Covid-19, according to CDC data; 46% of counties have high transmission and 17% have substantial transmission. Current CDC guidance states that all people age 2 and older who are not fully vaccinated should wear masks at school. White House officials have repeatedly said it would be up to the CDC whether to change official guidance and that they would follow the lead of health and medical experts. "It's based on the fact that the Delta variant is clearly more transmissible than the prior ones," the official said.

Source: CNN July 27, 2021 11:25 UTC