Blood samples dry during malaria screening. Public health workers call for more malaria testing in Africa to stop costly drugs from being handed out to kids with pneumonia. Paula Bronstein/Getty Images hide caption

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Hurricane Sandy's tear across the Caribbean left at least 54 dead in Haiti, where many people still live in tents because of damage from the 2010 earthquake. Thony Belizaire/AFP/Getty Images hide caption

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Dr. Esther Dalizu holds a pack of Coartem Malaria drugs in a pharmacy in Nairobi, Kenya, last year. Sayyid Azim/AP hide caption

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STD cupcakes: From Two Little Cats Bakery in Cambridge & Hertfordshire, these chocolate cupcakes feature symptoms of sexually transmitted diseases, including gonorrhea, syphilis, genital warts, chlamydia and HIV. Eat Your Heart Out 2012 hide caption

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Health employees protest outside the Health Ministry in Athens against pay and budget cuts. Fewer resources for malaria treatment and mosquito control may be contributing to malaria's comeback in Greece. Aris Messinis/AFP/Getty Images hide caption

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Polio's End Depends On Three Tough Countries

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Health workers transport the polio vaccine by donkey in southeastern Pakistan. Asad Zaidi/Courtesy of UNICEF Pakistan. hide caption

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The iPhone app Electronic Smoke simulates smoking by detecting sound waves. When you breathe into the microphone, the virtual cigarette burns. Screenshot from Electronic Smoke. hide caption

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When Infections "Spillover"

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An Indian child receives the oral polio vaccine. Twice a year, an army of 2 million volunteers fans out across India to administer the vaccine. India has not reported a single case of polio in more than a year-and-a-half. Julie McCarthy/NPR hide caption

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With An Army Of Vaccinators, India Subdues Polio

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Under the microscope, Mycobacterium tuberculosis bacteria. The germs that cause TB have become resistant to many drugs. Janice Haney Carr/CDC hide caption

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Social Mobilizers Combat Polio In Pakistan's Slums

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