Intrexon Corporation’s Oxitec Ltd. said Thursday that a neighborhood in Piracicaba, Brazil saw a 91% drop in dengue fever cases this year after the company’s genetically-engineered mosquitoes were released there. The effect, which compared the number of cases with the previous year, was an improvement above the 52% reduction in dengue fever seen in the municipality and unrelated to Oxitec’s mosquitoes. Oxitec’s genetically-engineered mosquitoes were released in Piracicaba’s 5,000 resident CECAP/Eldorado district, which last year saw much higher rates of dengue than the rest of Piracicaba, the company said. The data was courtesy of Piracicaba’s Epidemiologic Surveillance service. Oxitec has also proposed to release genetically-engineered mosquitoes in the Florida Keys, where the plan has met with local opposition.
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