Cattle feeding practices have been changed in an effort to halt the spread of mad cow disease. iStockphoto.com hide caption

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Mad Cow Disease: What You Need To Know Now

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Chickens were killed in Hong Kong last December in an effort to halt the spread of the deadly H5N1 strain of bird flu. Aaron Tam/AFP/Getty Images hide caption

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A makeshift latrine hangs over the water at the edge of Cite de Dieu, a slum in Port-au-Prince, Haiti. John W. Poole / NPR hide caption

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Port-Au-Prince: A City Of Millions, With No Sewer System

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Rice farmer Alexi Rochnel shows his blank cholera vaccination card. April is the beginning of Haiti's rainy season, which will likely intensify Haiti's cholera outbreak. John W. Poole / NPR hide caption

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Marlene Lucien controls the hose that fills people's plastic buckets on one busy street corner in Port-au-Prince, Haiti. John Poole/NPR hide caption

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Water In The Time Of Cholera: Haiti's Most Urgent Health Problem

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A micrograph shows red blood cells infected by the malaria parasite Plasmodium falciparum. John C. Tan/AP hide caption

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A young girl bathes in an irrigation canal. The canal and nearby river are the primary sources of water for most people who live in the country around Saint-Marc, Haiti. John W. Poole/NPR hide caption

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In Haiti, Bureaucratic Delays Stall Mass Cholera Vaccinations

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Health Department officials cull birds and put them in sacks after bird flu virus was detected in Bhubaneswar, India. Biswaranjan Rout/AP hide caption

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Bird Flu Studies Getting Another Round Of Scrutiny By Panel

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The C. difficile bacteria causes infections that kill about 14,000 Americans each year, the CDC reports. CDC Public Health Image Library hide caption

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Deaths From Dangerous Gut Bacteria Hit Historic Highs

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An health official wearing protective gear culls a bird at a poultry farm after a naturally occurring bird flu virus was detected near Agartala, India, in January. Sushanta Das/AP hide caption

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Expert Panel To Give Controversial Bird Flu Research A Second Look

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Ramon Maldonado-Cardenas grimaces as he gets a flu shot from pharmacy student Khoa Truong during a health fair in Sacramento, Calif., last October. Rich Pedroncelli/AP hide caption

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Nurse Susan Peel gives a whooping cough vaccination to a student at Inderkum High School in Sacramento, Calif., in 2011. Now it seems likely such shots will become routine for senior citizens, too. Rich Pedroncelli/AP hide caption

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