Here's why bird flu fears are intensifying

"This virus is not so easy to get rid of," says Dr. Jurgen Richt, a veterinary microbiologist at Kansas State University. "We will have to live with it for some years to come."

"This is exactly what we don't want to see," says Louise Moncla, a virologist at the University of Pennsylvania. "The case in British Columbia shows that flu is always going to surprise us."

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