The US Centers for Disease Control and Prevention is expected to update its guidelines on Tuesday to urge vaccinated people in certain areas of the country to resume wearing masks because of Covid-19.
People in areas with high or substantial Covid-19 transmission should resume wearing masks, the CDC is expected to say, according to sources familiar with the announcement. 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.
