Brazilian members of the United Nations Stabilization Mission In Haiti stand by a shelter in Les Cayes ahead of a visit by U.N. Secretary-General Ban Ki-moon on October 15, 2016. Hector Retamal/AFP/Getty Images hide caption

Goats and Soda
STORIES OF LIFE IN A CHANGING WORLDInfectious Disease
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The black-legged tick, ixodes scapularis, can spread Lyme disease. Smith Collection/Gado/Getty Images hide caption
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Dr. Thumbi Mwangi, an infectious disease epidemiologist from Kenya, at Howard Theatre in Washington, DC, on Nov. 29, 2016. In the U.S., Mwangi worked on a vaccine for cows that aimed to combat the same disease he saw the bovine battle in Kenya as a kid. Akash Ghai/for NPR hide caption
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Kadija Shellu is now 7. She had not only Ebola, but malaria as well. Ashoka Mukpo for NPR hide caption
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Fishermen in Papua New Guinea, living on their boats, wait for the tide to change before going out to fish. Tuberculosis is a major health threat in the Pacific Ocean nation. Jason South/The AGE/Fairfax Media via Getty Images hide caption
A shop owner holds a live chicken for sale in a Hong Kong market. Isaac Lawrence/AFP/Getty Images hide caption
Why Chinese Scientists Are More Worried Than Ever About Bird Flu
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A family member holds twins Eloisa (left) and Eloa, both 8 months old and born with microcephaly, during a Christmas gathering. The mother of the twins, Raquel, who lives in Brazil, said she contracted Zika during her pregnancy. Mario Tama/Getty Images hide caption
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They had the right idea: During the worldwide flu epidemic that began in 1918, women in this U.S. office wore cloth masks. Bettmann/Bettmann Archive hide caption
Saturday
Tucker Lane and his mother, Lynn Cash, sit in the wooded backyard of his home in West Barnstable, Mass. Kayana Szymczak for NPR hide caption
Beyond Lyme: New Tick-Borne Diseases On The Rise In U.S.
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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
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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