To Fight Dengue Fever, Brazil Turns to Genetically Modified Mosquitoes

Aedes aegypti Photograph by Bryan Reynolds/Getty Images

If you’re going to Brazil for the World Cup, don’t forget your insect repellent, and maybe one of these. The country has the highest incidence of dengue fever in the world, with 1.4 million cases reported last year. The disease infects at least 50 million people every year worldwide and kills over a million—the numbers have been rising in recent decades. Severe dengue was first spotted in Southeast Asia in the 1950s; it has now spread throughout Asia and Latin America. Recently it has spread to Europe. There is no cure and no vaccine.

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