The person, who recently travelled to the Middle East and Pakistan, is being treated in an intensive care unit at a Manchester hospital after becoming infected with a new type of coronavirus, the Health Protection Agency (HPA) said.
The latest case brings the total number of confirmed cases across the world to 10, the HPA added.
Last year a 49-year-old Qatari man was treated at St Thomas' hospital in London after becoming infected.
The latest case is the second to be identified in the UK. The HPA said there have been five cases confirmed in Saudi Arabia resulting in three deaths, while two patients treated in Jordan have both died.