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If Asian bird flu isn't in the U.S., why is everyone so concerned?
In rare cases, the current Asian strain has infected humans, but it is not easily transmitted from bird to human; only people who have had close physical contact with sick birds have become ill. While the virus has not yet shown the ability to move readily from person to person, it theoretically could mutate into a form that could be spread by infected people. It is this possibility that has health officials concerned.
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