Northern Ireland's health minister has asked the Irish Government to consider new laws and data-sharing agreements to help track international travellers arriving on the island.
Robin Swann has written to his counterpart Stephen Donnelly expressing concern about the "inability" of both jurisdictions to capture and share information about passengers transiting through one part of the island to the other.
In the letter, a leaked copy of which has been seen by the PA news agency, Mr Swann told Mr Donnelly that his officials were facing "serious impediments" in monitoring travellers who cross the border having landed in the Republic from an at-risk country.