Health officials warn that young people are expected to be hit the hardest this year by the H1N1 virus. Margaret Warner speaks with the director of the Centers for Disease Control and Prevention for more.

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In other news, a suicide bombing at a police station in Pakistan has killed at least 13 people, and in Iraq a bomber opened fire on a mosque in Tal Afar.

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Distribution centers around the country began receiving shipments of the much anticipated H1N1 flu vaccine this week. Those costs, as well as the economic blow of closed schools and lost productivity, could set back the fragile U.S. economy.

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The flu season might start earlier than expected, complicating efforts to distribute an H1N1 vaccine before people are infected. Betty Ann Bowser reports.

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Margaret Warner speaks with Dr. Anthony Fauci of the National Institute of Allergy and Infectious Disease about a new H1N1 flu vaccine.

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Amid renewed warnings of a potential H1N1 flu virus outbreak, one Colorado school district is taking new precautionary steps. Tom Bearden reports.

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In other news, a top U.S. military official warned that the Taliban has the upper hand in Afghanistan. Also, a typhoon tore through Taiwan over the weekend.

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In other news, Wall Street rallied on a Labor Department report that showed the U.S. economy lost fewer jobs than expected in July, and President Obama signed a $2 billion extension of the "cash for clunkers" incentive program.

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In other news, the Federal Reserve indicated that the recession might be easing up but said the labor market remains soft, and Microsoft announced a long-awaited partnership with Yahoo.

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The Centers for Disease Control's advisory committee on immunization met Wednesday in an emergency session to set priorities for who should receive the H1N1 influenza vaccine now in development.

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