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    Four U.S. lab workers treated for anthrax exposure

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Four U.S. lab workers treated for anthrax exposure

More than two dozen lab workers, including four in the U.S., are now being treated for anthrax exposure. CNN's Barbara Starr reports.

Four U.S. lab workers treated for anthrax exposure

More than two dozen lab workers, including four in the U.S., are now being treated for anthrax exposure. CNN's Barbara Starr reports.