To prevent further spread of the COVID-19 delta variant, the U.S. Centers for Disease Control and Prevention updated its mask guidance on Tuesday.
The CDC now recommends that fully-vaccinated people wear masks in public indoor settings to help prevent the spread of the delta variant.
On May 13, when the CDC previously revised its guidance for fully-vaccinated people to unmask, the delta variant only represented 1% of reported infections. Now, according to the CDC, it represents at least 83% of cases.
“Information from several states and other countries indicated that on rare occasions, some vaccinated people infected with the delta variant after vaccination may be contagious and spread the virus to others,” CDC director Dr. Rochelle Walensky said.
The CDC also recommends when school returns, for everyone at K-12 schools to wear a mask indoors, including teachers, staff, students and visitors, regardless of vaccination status.