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A medical staffer at a New Jersey detention center has become the first confirmed Immigration and Customs Enforcement employee to test positive for the coronavirus, the agency said Thursday.

The patient works at the Elizabeth Detention Center and was already under self-quarantine when they tested positive, according to ICE spokesman Emilio Dabul.

Nobody else at the New Jersey facility, including other staff members and ICE detainees, are showing symptoms of the virus, Dabul said.

Nationally, one other ICE worker has tested positive for the virus, the agency told The Marshall Project, without specifying where.

As of Thursday night, there were no ICE detainees with a confirmed case of the bug.

“ICE is actively working with state and local health partners to determine if any detainee requires additional testing or monitoring to combat the spread of the virus,” Dabul said.