ABC News May 16, 2021

CDC mask guidelines for schools to remain for rest of school year

WATCH: CDC defends new COVID-19 guidelines

The Centers for Disease Control and Prevention is recommending schools keep to the current COVID-19 guidelines, including mask-wearing and distancing, for the remainder of the school year as most students aren't fully vaccinated.

The agency provided the update on May 15 to clear up any confusion by the public following its announcement Thursday that vaccinated Americans can go maskless both indoors and outdoors.

MORE: New mask guidance does not grant permission for widespread mask removal: Walensky

The CDC noted that coronavirus vaccines are only available for people over the age of 12, leaving millions of school-age children unprotected from the virus.

Seth Wenig/AP, FILE
Students line up to enter Christa McAuliffe School in Jersey City, N.J., April 29, 2021.

"Systems and policy adjustments may be required for schools to change mask requirements for students and staff while continuing to ensure the safety of unvaccinated populations," the agency said in its recommendation.

The CDC said it will update its guidance for schools in the coming weeks.

As of Sunday, more than 123 million Americans over the age of 12 are fully vaccinated, according to CDC data. That represents roughly 44% of the American population over 12, the CDC said.

Charlie Riedel/AP, FILE
Students sit separated by plastic dividers during lunch at Wyandotte County High School in Kansas City, Kan., March 21, 2021.

Although the agency's guidance permits vaccinated Americans to go maskless, several states haven't lifted their mask mandates, and officials are urging Americans to get their shots as soon as they can.