50% Chance of Bird-Flu Mutation to Attack Humans, Says "Flu Hunter"

Robert G. Webster is one of the few bird flu experts confident enough to answer the key question: Will the avian flu switch from posing a terrible hazard to birds to becoming a real threat to humans?

There are 'about even odds at this time for the virus to learn how to transmit human to human,' he told ABC's 'World News Tonight.' Webster, the Rosemary Thomas Chair at St. Jude Children's Research Hospital in Memphis, Tenn., is credited with being the first scientist to find the link between human flu and bird flu.

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