A subtype of avian flu virus, endemic in poultry farms in China, is undergoing mutational changes, which could increase the risk of the disease being passed on to humans, warns a study.Researchers in China and Nottingham, the UK, also said that .
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Using laboratory ferrets and mice, researchers from China and the UK found that humans could be "vulnerable" to infection from the H3N8 strain of bird flu at "epidemic or pandemic proportions"