Nightly News   |  August 24, 2009

Swine flu could infect half of U.S. population

Aug. 24: The White House today declared the H1N1 swine flu virus as a serious threat to the nation, saying 30-50 percent of the U.S. population will catch it, and predicting as many as 90,000 deaths, mostly among children and young adults. NBC Chief Science Correspondent Robert Bazell reports.

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