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US health leader warns of human-to-human H7N9 bird flu

There is no evidence that the deadly H7N9 bird flu has yet spread between humans in China but health authorities must be ready for the virus to mutate at any time, a top US virologist has warned. Anthony Fauci, the head of the National Institute of Allergy and Infectious Diseases (NIAID), said officials in China had studied more than 1,000 close contacts of confirmed cases and not found any evidence of human-to-human transmission.
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