Fifty-three people who work at California state prisons have tested positive for COVID-19, according to new figures released on Sunday.

The California Institute for Men, in Chino, had 16 reported cases, the most among 18 state facilities — including prisons and other offices — where employees have reported positive tests, according to the Department of Corrections and Rehabilitation.

California State Prison, Sacramento had five positive tests and Folsom State Prison had four, according to a tally the corrections department keeps on its website.

Among the offices with a positive test is the department’s headquarters at 1515 S Street, according to an email sent to employees in the building Friday.

The number is up from a dozen workers on March 26.

After staff members test positive, the corrections department restricts movement at their institutions and works to identify who the infected person has been in contact with, according to the department. The institutions restrict movement and quarantine people determined to be at risk.

Employees at the institutions are screened for COVID-like symptoms at the gates and turned away if they have symptoms, the department has said.

Seventeen inmates have tested positive, with eight at California State Prison, Los Angeles County; seven at the California Institute for Men; one at North Kern State Prison and one at California Substance Abuse Treatment Facility and State Prison, Corcoran.

The department has ended in-person visits to inmates and is deep-cleaning common areas more frequently.

California has 35 state prisons and about 57,000 people work for the corrections department, according to state budget documents. About 28,000 of them are correctional officers.

A federal court on Saturday rejected an emergency plea from attorneys to release thousands of inmates to protect them from the coronavirus. The judges ruled the request wasn’t permissible on procedural grounds under a 2009 federal order that placed the state’s prisons under federal oversight.

The corrections department has published extensive guidance for employees at its website, including instructions for keeping home and work surfaces clean, keeping in communication with loved ones during the pandemic and talking to children about what is happening at https://www.cdcr.ca.gov/covid19/information/.

This story was originally published April 6, 2020 at 1:02 PM.