New CDC Masking Recommendations Apply To Majority Of U.S. Counties

Americans who have been fully vaccinated against COVID-19 should continue wearing masks in indoor public settings when in areas of high COVID-19 transmission, the Centers for Disease Control and Prevention (CDC) recommended on Tuesday. 

The guidelines apply to areas designated as having “substantial” or “high transmission.” The CDC defines substantial transmission as counties with more than 50 new cases per 100,000 residents over a seven-day period; high transmission is defined as counties with more than 100 new cases per 100,000 residents over a seven-day period. (High test positivity rates can also land a county in a substantial- or high-transmission category.)