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Deadly Strain Of Bird Flu Is 'Most Lethal' Flu Virus Yet

Apr 24, 2013 (Talk of the Nation) — At a briefing in Beijing Wednesday, World Health Organization officials called the H7N9 bird flu that's emerged in China one of the "most lethal" flu viruses so far. NPR science correspondent Richard Knox talks about what we know, and the questions that remain about the deadly strain.

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