Pig farm workers push live pigs into a large grave in Nipah in 1999. To stop the outbreak, the Malaysian government culled almost 1 million pigs, nearly destroying the country's pork industry. Andy Wong/AP hide caption

Goats and Soda
STORIES OF LIFE IN A CHANGING WORLDInfectious Disease
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Each year thousands of people from around the world tour the Gomantong Cave in Borneo. Although scientists have found a potentially dangerous virus in bats that roost in the cave, no one has ever gotten sick from a trip here. Razis Nasri hide caption
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Brazilian howler monkeys are known to carry yellow fever — and can die of the disease. Miguel Rangel Jr/Flickr hide caption
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A child with nodding syndrome waits for treatment at an outreach site in Uganda's Pader district. Matthew Kielty for NPR hide caption
Scientists May Have Solved The Mystery Of Nodding Syndrome
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Once called the "Dutchmen" because of their large noses and large bellies, proboscis monkeys live only in Borneo. Ecosystems that have a lot of diverse animals, like this monkey, also tend to have a lot of diverse viruses. Charles Ryan hide caption
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A Short History Of Humans And Germs Xaver Xylophon for NPR hide caption
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Malaria parasites, spread by a mosquito's bite, have started to adapt so the go-to drugs won't knock them out. Daniel Heuclin/Nature Picture Li/Getty Images/Nature Picture Libr hide caption
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This illustration depicts Klebsiella pneumoniae bacteria, which can cause different types of infections, including pneumonia, bloodstream infections and meningitis. CDC hide caption
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Mireille Kamariza, a graduate student in Stanford, is trying to develop a faster test to diagnose TB. Fred Tomlin/Courtesy of Mireille Kamariza hide caption