Health officials say a person has been infected with a strain of influenza similar to a virus that spreads to pigs in the United Kingdom. This is the first time this person has been found in the UK and close contact tracing is currently underway. A(H1N2)v case was detected as part of routine influenza surveillance following examination by a GP. The affected person had mild symptoms but made a full recovery. The source of her infection is under investigation. There is no evidence that influenza strains can be transmitted from person to person. Human infections with swine influenza viruses do occur, and in the past 20 years, 50 cases of A(H1N2)v infection in humans have been reported worldwide. One case was reported in the United States in August. The infection detected in the UK is slightly different from influenza strains that have recently appeared in humans elsewhere, but is similar to the UK pig virus. In 2009, a human swine influenza pandemic occurred, caused by a virus that spread between pigs, birds, and humans. Meera Chand, incident director at the UK Health Security Agency (UKHSA), said: "We are working rapidly to trace close contacts and reduce any potential spread. "In accordance with established protocols, investigations are underway to learn how the individual acquired the infection and to assess whether there are any further associated cases." Chief Veterinary Officer Christine Middlemiss said: "We know that some diseases of animals can be transferred to humans - which is why high standards of animal health, welfare and biosecurity are so important." She said pig keepers must report any signs of swine flu in their herds to their local vet.