The dengue virus has an icosahedral shape, similar to the pattern on a soccer ball. Antibodies stop the virus by binding to its surface. Laguna Design/Science Source hide caption

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Kevin Flores, 11, remains under a mosquito net while being treated for dengue fever at La Mascota hospital in Managua, Nicaragua, last fall. Inti Ocon/AFP/Getty Images hide caption

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The World Cup will come to the Arena de Sao Paola, shown here when it was under construction last fall. Brazil is also making a big push to control the local mosquitoes that can spread dengue fever. Friedemann Vogel/Getty Images hide caption

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The chikunguyna virus was discovered in 1955 by two scientists in Tanzania. EMDataBank using UCSF Chimera 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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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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Dengue fever patients are treated in a hospital in Asuncion, Paraguay, in January. Norberto Duarte/AFP/Getty Images hide caption

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If you catch dengue fever in the Western Hemisphere, it most likely came from the Aedes aegypti mosquito. Muhammad Mahdi Karim / hide caption

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A health worker in the Domincan Republic sprays insecticide between houses to stop dengue fever outbreaks this month. Erika Santelices/AFP/Getty Images hide caption

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Researchers hope to keep the mosquito that transmits dengue, Aedes aegypti, from infecting humans using the Wolbachia bacterium. James Gathany/CDC Public Health Image Library hide caption

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