SAN FRANCISCO — A San Francisco Sheriff’s Office deputy assigned to a county jail has tested positive for the COVID-19 novel coronavirus, authorities said Sunday.

The sheriff’s office said they learned the deputy, who works at the No. 4 County Jail, 850 Bryant St., tested positive at a health facility outside the city.

“While we are saddened that one of our colleagues has tested positive, we are also well prepared to take the next steps to prevent further exposure to our staff and the incarcerated,” Sheriff Paul Miyamoto said in a statement.

“We’re working to reassure the loved ones of those in our custody and care that they are safe while giving our staff the tools and support they need to feel protected.”

To that end, the department said it had developed an action plan in the wake of San Francisco Mayor London Breed’s state-of-emergency declaration Feb. 25. It plans to carry out efforts to limit exposure and respond to deputies’ equipment needs and safety protocols, as well as carry out any necessary screening and isolation efforts in jail areas where the deputy worked.

So far, there have been no known cases of COVID-19 among county jail inmates.

Check back for updates.

Contact George Kelly at 408-859-5180.