Atlanta Public Schools announced two more workers have tested positive for COVID-19, bringing the total number of known cases within the district to three.

Superintendent Meria Carstarphen on Friday notified parents and staff in a letter. She said an APS employee and a contractor who works for the district both tested positive, but said they have had limited contact with others.

The district last held in-school instruction March 13, and has since had employees and students working from home. 

In one case reported by APS on Friday, an employee who tested positive “had very limited contact with others through a volunteer activity at Toomer Elementary School last week,” Carstarphen wrote.

“If you or your child was at Toomer Elementary School last week, we ask that you monitor yourself or your child’s health for fever and symptoms of respiratory illness. In the unlikely event that you or your child develops a fever, runny nose, cough and/or shortness of breath, call your healthcare provider immediately,” Carstarphen wrote.

A contract employee who worked at the district’s downtown headquarters, the Alonzo A. Crim Center for Learning and Leadership, also tested positive for COVID-19, Carstarphen said.

That worker had limited exposure to staff and students, she said, and “we are beyond the 14-day transmission period from the last time the contract employee was at (building).”

The district's first case, an employee who worked at North Atlanta High School, was announced March 19. The district said students were not exposed to that person.