Scientists sounded warnings Wednesday over H7N9 bird flu in China and the H1N1 strain of swine flu in India that have jointly claimed more than 1,700 lives. H7N9 virus presents a high risk of becoming pandemic if China fails to close loopholes in its live poultry trade, researchers reported in the journal Nature. A different team, writing in the US journal Cell Host and Microbe, said a strain of H1N1 "swine" flu in India may have acquired mutations enabling it to spread more readily. Looking at H7N9, epidemiologists led by Yi Guan at the University of Hong Kong sought to understand why this dangerous strain emerged in China in 2013, faded away and then rebounded in 2014.
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