The Nebraska Department of Correctional Services says four more employees recently tested positive for COVID-19.
The department says the staff members work at the Lincoln Correctional Center, Diagnostic and Evaluation Center, Omaha Correctional Center and the Nebraska State Penitentiary.
A department spokesperson says the employees are self-isolating at home, and anyone who may have been in close contact with them will be asked to quarantine.
Thirty-seven NDCS employees have now been diagnosed with the virus.