LONDON, Apr 5: Genetic sequence data on a deadly strain of bird flu previously unknown in people show the virus has already acquired some mutations that might make it more likely to cause a human pandemic, scientists say. But there is no evidence so far that the H7N9 flu – now known to have infected nine people in China, killing three – is spreading from person to person, and there is still a chance it might peter out and never fully mutate into a human form of flu. (agencies)
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