The Centre for Health Protection is monitoring three additional Middle East Respiratory Syndrome cases reported in Korea.
Health authorities there said the patients had had contact with confirmed cases.
To date, Korea has confirmed 164 MERS cases, and another was exported from Korea to Mainland China.
The centre urges people to pay special attention to their safety when travelling, and to consider the health risks of the places they visit.
The centre is staying in close contact with the World Health Organisation and Korean health authorities.
