A worker fogs a neighborhood on the outskirts of Colombo in Sri Lanka in an effort to ward off mosquitoes. The country is facing an outbreak of dengue fever, a mosquito-borne disease. Ishara S. Kodikara/AFP/Getty Images hide caption

Goats and Soda
STORIES OF LIFE IN A CHANGING WORLDInfectious Disease
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Maria Carolina Silva Flor and Joselito Alves dos Santos with their 18-month-old daughter, Maria Gabriela Silva Alves. The baby was born with Zika syndrome. Amanda Klasing hide caption
Thursday
Ticks of the genus Hyalomma, pictured here, are principally responsible for passing on Crimea-Congo hemorrhagic fever to humans. Adam Cuerden hide caption
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The scene after a mortar attack on the southern city of Taez. Ahmad Al-Basha/Getty Images hide caption
Wednesday
Nurses give the oral polio vaccine to a Syrian child in a refugee camp in Turkey. The oral polio vaccine used throughout most of the developing world contains a form of the virus that has been weakened in the laboratory. But it's still a live virus. Carsten Koall/Getty Images hide caption
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Spillover Beasts: Which Animals Pose The Biggest Viral Risk?
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A tuberculosis patient in a hospital for chest diseases in the Indian region of Kashmir. NurPhoto/Getty Images hide caption
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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
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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