Health officials are scrambling to trace contacts of a person infected with a new form of swine flu, after the UK detected its first human case of H1N2. Fifty human cases of the strain have been reported globally since 2005. The UK Health Security Agency has formally notified the World Health Organization (WHO) about the discovery. Pig keepers must also report any suspicion of swine flu in their herds to their local vet immediately.”H1N1, H1N2 and H3N2 are major subtypes of swine flu A viruses in pigs and occasionally infect humans. In 2009, there was a pandemic in humans caused by H1N1, commonly referred to as swine flu.