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Doctor on bird flu: "So far, no real risk to the human population"

Six states are reporting bird flu outbreaks among dairy cows and this week the CDC reported that a Texas dairy worker had tested positive for the virus, becoming the second known human case in the U.S. Dr. William Schaffner, professor of infectious diseases at Vanderbilt University Medical Center, joined CBS News to discuss how worried people should be about the virus.
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