New swine flu with pandemic potential identified by China researchers

G4 strain has already infected 10% of industry's workers in China but no evidence yet that it can be passed from human to human

Researchers in China have discovered a new type of swine flu that is capable of triggering a pandemic, according to a study in the US science journal PNAS, although experts said there is no imminent threat.

Named G4, it is genetically descended from the H1N1 strain that caused a pandemic in 2009.