The H1N1 virus, commonly known as swine flu virus, could infect between 30 percent and 50 percent of the American population during the fall and winter and lead to as many as 1.8 million U.S. hospital admissions, the President's Council of Advisors on Science and Technology reported.

The report says 30,000 to 90,000 deaths are projected as part of a "plausible scenario" involving large outbreaks at schools, inadequate antiviral supplies and the virus peaking before vaccinations have time to be effective.

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