There are fears that a nine-month-old baby could have the deadly coronavirus following a trip to China.
The mother took the child to A&E at Altnagelvin Hospital on Thursday. Medics were reportedly waiting on them.
The baby is said to have travelled back from Hong Kong with the parents last week.
Altnagelvin Hospital followed its emergency protocol.
The Western Health and Social Care Trust said it would not comment on individual cases.
The UK Chief Medical Officers have assessed that the risk to the public is moderate.
The number of confirmed UK cases is three.