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FILE - In this Friday, Feb. 5, 2016 file photo, Nadia Gonzalez, enclosed in a mosquito net, recovers from a bout of dengue fever at a hospital in Luque, Paraguay. Drugmaker Sanofi said Thursday, Nov. 30, 2017, that its dengue vaccine _ the world’s first _ could put people at risk of severe disease if they haven’t previously been infected, according to new long-term data. (AP Photo/Jorge Saenz, File)

FILE - In this Friday, Feb. 5, 2016 file photo, Nadia Gonzalez, enclosed in a mosquito net, recovers from a bout of dengue fever at a hospital in Luque, Paraguay. Drugmaker Sanofi said Thursday, Nov. 30, 2017, that its dengue vaccine _ the world’s first _ could put people at risk of severe disease if they haven’t previously been infected, according to new long-term data. (AP Photo/Jorge Saenz, File)

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