A student gets vaccinated against pertussis at a Los Angeles middle school in 2012. The state required that students be immunized to halt an epidemic of whooping cough. Kevork Djansezian/Getty Images hide caption

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A doctor takes an HIV test from an athlete during the 18th National Sports Festival in Lagos, Nigeria, last December. Sunday Alamba/AP hide caption

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Inspector Mohammad Saleem Taqi takes a photo of sanitation workers as they clear out debris in sewers. The government feeds the photos into a map to track the city's effort to stop dengue fever. Beenish Ahmed/NPR hide caption

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How Smartphones Became Vital Tools Against Dengue In Pakistan

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Kali Hardig, 12, was released from a hospital in Little Rock, Ark., on Sept. 11 after surviving a brain infection caused by amoebas. Danny Johnston/Associated Press hide caption

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In 2010, Florida health officials looked for mosquito larvae in vehicle tires where water had collected. As many as 15 cases have been found in Stuart this year. Joe Raedle/Getty Images hide caption

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Florida Officials Swat At Mosquitoes With Dengue Fever

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A Cambodian boy gets tested for malaria at a clinic along the Thai-Cambodian border in 2010. Three strains of drug-resistant malaria have emerged from this region over the past 50 years. Paula Bronstein/Getty Images hide caption

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Signs of tuberculosis have been found in ancient Egyptian mummies, such as this one in London's British Museum. Klafubra/Wikimedia.org hide caption

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Percentage of deaths each year due to neonatal disorders around the globe. Courtesy of the Institute for Health Metrics and Evaluation hide caption

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Latinos and African-Americans are more active on social media. Could that help promote HIV testing among minorities? Brendan Smialowski/Getty Images hide caption

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In early August, Israel launched a mass campaign to vaccinate children against polio, including this little girl at a clinic in Rahat. David Buimovitch/AFP/Getty Images hide caption

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To Keep Polio At Bay, Israel Revaccinates A Million Kids

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So cute, but not cuddly. The Egyptian tomb bat, Taphozous perforatus, is a likely carrier of the Middle East respiratory syndrome virus, or MERS. Courtesy of Jonathan H. Epstein/EcoHealth Alliance hide caption

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