Washington (CNN) Twenty-seven migrant children in government custody had tested positive for coronavirus as of Monday, according to the latest update from the Office of Refugee Resettlement, the federal agency charged with their care.

Six of the 27 have recovered; others are in medical isolation in two Texas facilities and one Illinois facility, the agency said in a statement Tuesday. None of the children have required hospitalization.

The number of cases among unaccompanied migrant children in care has gradually increased over recent weeks. Citing an abundance of caution, the refugee agency stopped placing children in California, New York and Washington -- among the hardest-hit states -- with limited exceptions earlier this year. In all 87 children have been tested.

There are approximately 2,500 children in the care of the Office of Refugee Resettlement, which is part of the Department of Health and Human Services.

HHS funds a network of more than 100 facilities where migrant children who arrived in the United States without parents or guardians are provided care until they're released to sponsors. The children are turned over to HHS after being taken into custody by the Department of Homeland Security.

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