A federal appeals court has upheld the mask requirement for Knox County Schools.

A U.S. Court of Appeals for the 6th Circuit panel on Monday denied the school board’s request to pause the mask requirement while the issue is debated in court, the Knoxville News Sentinel reported.

U.S. District Judge J. Ronnie Greer ruled in September the school system must adopt a mask mandate to help protect children with health problems more susceptible to the coronavirus pandemic.

Knox County Schools argued virtual classes are a reasonable accommodation, but children attend at home and must be supervised.

“Like the district court, we are not persuaded that virtual schooling is a reasonable alternative to universal masking,” the appeals court wrote. The full appeal of the Knox County case will be heard at a later date, the newspaper reported.

Knox County adopted a mask mandate during the 2020-21 school year but chose not to this year despite COVID-19 numbers that remained high. Public health agencies say indoor mask-wearing is a key coronavirus-prevention tool.