Washington (CNN) The federal agency tasked with caring for unaccompanied migrant children told staff at shelters Monday that children who may have been exposed to or at risk from coronavirus must be flagged to the health division within four hours, according to an email obtained by CNN.

Children found to be exposed to coronavirus and with symptoms of respiratory disease should also be isolated, the agency told shelters.

Care providers are generally expected to have "an identified space within the shelter facility that may be used for quarantine or isolation" in that a child needs to be separated for a medical reason, according to the agency's website

The guidance sent out by the US Department of Health and Human Services's Office of Refugee Resettlement is indicative of the increased vigilance across the government amid concerns over coronavirus. The dispatch lists symptoms of coronavirus, the agency's response, and specific guidance to ORR care providers.

The Office of Refugee Resettlement is responsible for migrant children who come to the United States without a parent or guardian. While in government custody, the children stay at shelters across the country.

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