The first human case of a new strain of swine flu has been found in Britain and health officials are trying to trace the origin of the virus.

On Monday, the UK Health Protection Agency verified that one person has tested positive for influenza A H1N2v,

Which is a different but similar virus to the wild flu virus that has been circulating in pigs across the country.

According to preliminary data, H1N2 infection in the UK is genetically unique from other recent human cases globally in its clade, or variant, designated 1b.1.1.

“We are working quickly to trace close contacts and minimize any potential spread,” says Meera Chand, UKHSA incident director.

"As per established protocols, an investigation is underway to determine how the individual contracted the infection and to assess if there are any further related cases."

Details regarding the patient's age or general health have not been publicly released, but it is known that the patient had a mild illness and has made a full recovery.

Outbreaks of swine flu, a respiratory disease of pigs caused by Type A flu viruses, occur frequently in pigs, and people sometimes become infected.

Human infections by influenza A subtypes, H1N1v, H3N2v and H1N2v, have already been identified, with the CDC reporting the first US human cases in August this year.

Although H1N2v has never been found in humans in Britain before, the UKHSA says that since 2005, 50 human cases have been reported elsewhere around the world.