Genetically modified mosquitoes are released in Piracicaba, Brazil, in an effort to combat Zika virus. These mosquitoes were modified using conventional techniques.
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There are about 1,000 genetically engineered mosquitoes in each pot. Guilherme Trivellato of the biotech company Oxitec prepares to release them in Piracicaba, Brazil, in the hope of reducing the spread of Zika and other viruses.
Catherine Osborn/for NPR