US urges vaccinated Americans to wear masks indoors in many places

Americans fully vaccinated against Covid-19 should go back to wearing masks in indoor public places in regions where the coronavirus is spreading rapidly, US health authorities said on Tuesday.

In a toughening of guidance issued earlier this month, the US Centers for Disease Control and Prevention (CDC) also recommended all students, teachers and staff at schools for kindergarten through 12th grade wear masks regardless of whether they were vaccinated...