Long Creek Youth Development Center on Westbrook Street in South Portland. Credit: Troy R. Bennett / BDN

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Inmates and staff at Maine’s only youth prison will be tested for the new coronavirus after a 16-year-old girl tested positive before being released.

The girl was in the Maine Department of Corrections’ care for 21 days before she was released Friday from Long Creek Youth Development Center in South Portland, according to the Maine Department of Corrections. She was tested the same day and asymptomatic at the time, said Department of Corrections Commissioner Randall Liberty. The department learned of her results on Saturday.

The department tests all inmates prior to release, but Liberty said youth may be released by a judge prior to a test result coming back. He said the department “typically” tests youth when they arrive.

The girl is now under quarantine, according to the Department of Corrections.

No other staff or inmates are symptomatic now, according to a Monday press release. But Liberty said they are still waiting on testing results for 35 prisoners and 187 staff members.

In addition to universal testing at the South Portland facility, the department will require more use of personal protective equipment and medical monitoring.

So far, four adults have tested positive for the coronavirus within the Maine prison system as of Friday, according to the Department of Corrections.