Researchers are worried the bird flu strain could one day become a 'doomsday virus' capable of human-to-human infection. Photo: AP

Genes make H7N9 nimble killer, study finds

Researchers are worried the bird flu strain could one day become a 'doomsday virus' capable of human-to-human infection

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Researchers are worried the bird flu strain could one day become a 'doomsday virus' capable of human-to-human infection. Photo: AP
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