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FILE - In this Tuesday, Jan. 26, 2016 file photo, a health workers stands in the Sambadrome spraying insecticide to combat the Aedes aegypti mosquito that transmits the Zika virus in Rio de Janeiro, Brazil. In the 1940s and 1950s, Brazilian authorities made such a ferocious assault on Aedes aegypti that the mosquito, that it was eradicated from Latin America's largest country by 1958. But eradication experts say there is little chance that Brazil can come anywhere near stamping out the pest like it did a half century ago. (AP Photo/Leo Correa, File)

FILE - In this Tuesday, Jan. 26, 2016 file photo, a health workers stands in the Sambadrome spraying insecticide to combat the Aedes aegypti mosquito that transmits the Zika virus in Rio de Janeiro, Brazil. In the 1940s and 1950s, Brazilian authorities made such a ferocious assault on Aedes aegypti that the mosquito, that it was eradicated from Latin America's largest country by 1958. But eradication experts say there is little chance that Brazil can come anywhere near stamping out the pest like it did a half century ago. (AP Photo/Leo Correa, File)

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