China Bird Flu Appears to Have Spread From Person to Person

Single reported case does not mean pandemic is likely, although vigilance is needed, experts say

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"It would be wrong for people to let down their guard now. We need to be vigilant, and we need to keep watching for cases," Hartl said. "It's out there still. That we know, because we haven't found the source definitively. So we need to expect to see more cases."

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To learn more about H7N9 bird flu, visit the U.S. Centers for Disease Control and Prevention.

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