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ELIZABETH VARGAS (ABC NEWS) (Off-camera) Now we're gonna turn to the alarm over that new and mysterious bird flu spreading in China. [ABSTRACT FROM PUBLISHER]

DAVID MUIR (ABC NEWS) (Off-camera) And we move on here this evening to another major world headline, rising fear over an outbreak, a new and dangerous strain of the bird flu, so far, contained to China. But tonight, right here in the US, top scientists are now racing to develop a vaccine and if they're concerned, how concerned should the rest of us be? ABC's chief medical editor Dr Richard Besser tonight. [ABSTRACT FROM PUBLISHER]