Playing God: Genna Reed Investigates GM Mosquitoes Released Into The Wild.

Brazil said it will breed huge numbers of genetically modified mosquitoes to help stop the spread of dengue fever, an illness that has already struck nearly 500,000 people this year nationwide, killing 74.

Dengue affects between 50 and 100 million people in the tropics and subtropics each year, causing fever, muscle and joint ache as well as potentially fatal dengue hemorrhagic fever and dengue shock syndrome.

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