Majority of Massachusetts counties at high or substantial risk for COVID transmission, should be wearing masks indoors, CDC says. Updated: Aug. 04, 2021, 11:18 a.m.

There are now nine counties in Massachusetts where people are being asked to wear masks indoors, even if you're fully vaccinated, because transmission rates of coronavirus are high or substantial.

There are now 12 counties in Massachusetts where it's recommended that people wear masks indoors, even if you're fully vaccinated, because transmission rates of coronavirus are high or substantial.