A woman whose son has HIV cries during an AIDS awareness event Tuesday, World AIDS Day, held at Beijing's south railway station. A new report by UNAIDS says 42 percent of AIDS sufferers in China have experienced discrimination because of their condition. Andy Wong/AP hide caption

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An Iraqi schoolgirl wears a protective mask as she is walked to school in the central Iraqi city of Kut, Oct. 19, 2009. Panic over swine flu prompted officials in Iraq to close about 2,000 schools in a bid to combat the virus. Ali al-Alak/AFP/Getty Images hide caption

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In this illustration, new viruses emerge from an infected human throat cell. When you get the flu, viruses turn your cells into tiny virus factories that help spread the disease. Courtesy XVIVO/Zirus hide caption

toggle caption Courtesy XVIVO/Zirus

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