Opposition presidential candidate Mauricio Macri, left, and running mate Gabriela Michetti celebrate after winning a runoff presidential election in Buenos Aires, Argentina, on Sunday. Ricardo Mazalan/AP hide caption

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South America has a tradition of offering a haven to refugees, including my grandfather, Miguel Garsd, pictured here in Argentina, where he began practicing medicine in the 1930s. His family had fled pogroms in the Ukraine in the late 1800s. Courtesy of Jasmine Garsd hide caption

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Francisco Carlos Fonseca is the manager of Marina Confiança, a resort located on the banks of the Cantareira reservoir system. Behind him is a boat ramp that once led to a lake that he says used to be more than 100 feet deep. Kainaz Amaria/NPR hide caption

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The Aedes mosquito can spread Zika virus in addition to dengue fever and chikungunya virus. The virus was first spotted in the Americas in 2014. Universal History Archive/UIG via Getty Images hide caption

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