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Genetically Modified Mosquito Sparks a Controversy in Florida

June 5, 2015

Genetically Modified Mosquito Sparks a Controversy in Florida

Officials in the Florida Keys are seeking to use a GM mosquito that could help prevent a recurrence of dengue fever there. But fears among some residents — which scientists say are unfounded — are slowing the release of mosquitoes whose offspring are genetically programmed to die.


When people think of genetically modified organisms, food crops like GM corn and soybeans usually come to mind. But engineering more complex living things is now possible, and the controversy surrounding genetic modification has now spread to the lowly mosquito, which is being

aedes aegypti

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An Aedes aegypti mosquito, the species that primarily transmits dengue fever.

genetically engineered to control mosquito-borne illnesses.

A U.K.-based company, Oxitec, has altered two genes in theAedes aegypti mosquito so that when modified males breed with wild females, the offspring inherit a lethal gene and die in the larval stage. The state agency that controls mosquitos in the Florida Keys is awaiting approval from the federal government of a trial release of Oxitec’s genetically modified mosquitos to prevent a recurrence of a dengue fever outbreak. But some people in the Keys and elsewhere are up in arms, with more than 155,000 signing a petition opposing the trial of genetically engineered mosquitoes in a small area of 400 households next to Key West.

Many scientists say, however, that genetically modifying the Aedesmosquito — and possibly other types of mosquitoes carrying diseases such as malaria — is a more effective and environmentally benign way of controlling mosquito-borne illnesses than spraying pesticides and other measures. Oxitec’s genetically engineered Aedes aegypti has proven itself in other countries, successfully reducing populations of the insect by up to 90 percent in field trials in the Cayman Islands, Brazil, Malaysia, and Panama. Overall, the trials were so successful that Brazil approved the use of the GM mosquitoes last year. 

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