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This is a Thursday, Feb. 11, 2016, file photo of aedes aegypti mosquitoes in a mosquito cage at a laboratory in Cucuta, Colombia. The World Health Organization says it may be necessary to use controversial methods like genetically modified mosquitoes to wipe out the insects that are spreading the Zika virus across the Americas.  (AP Photo/Ricardo Mazalan, File)
Photo by: Ricardo Mazalan
This is a Thursday, Feb. 11, 2016, file photo of aedes aegypti mosquitoes in a mosquito cage at a laboratory in Cucuta, Colombia. The World Health Organization says it may be necessary to use controversial methods like genetically modified mosquitoes to wipe out the insects that are spreading the Zika virus across the Americas. (AP Photo/Ricardo Mazalan, File)

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