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Gene-altered mosquitoes could be used against dengue fever
KEY WEST, Fla. (AP) — Mosquito control officials in the Florida Keys are waiting for the federal government to sign off on an experiment that would release hundreds of thousands of genetically modified mosquitoes to reduce the risk of dengue fever in the tourist town of Key West.
If approved by the Food and Drug Administration, it would be the first such experiment in the U.S. Some Key West residents worry, though, that not enough research has been done to determine the risks that releasing genetically modified mosquitoes might pose to the Keys’ fragile ecosystem.
Officials are targeting the Aedes aegypti mosquitoes because they can spread dengue fever, a disease health officials thought had been eradicated in the U.S. until 93 cases originated in the Keys in 2009 and 2010.
The trial planned by mosquito control officials and the British company Oxitec would release nonbiting male mosquitoes that have been genetically modified to pass along a birth defect that kill their progeny before reaching maturity. The idea is that they will mate with wild females and their children will die before reproducing. After a few generations, Key West’s Aedes aegypti population would die off, reducing the dengue fever risk without using pesticides and at relatively a low cost, the proponents say.
There is no vaccine for dengue fever.
“The science of it, I think, looks fine. It’s straight from setting up experiments and collecting data,” said Michael Doyle, pointing to research Oxitec has had published in peer-reviewed scientific journals. He inherited the project when he took the lead at the Florida Keys Mosquito Control District in mid-2011.
The district’s website says the modified genes will disappear from the environment after the mosquitoes carrying it die, resulting in no permanent change to the wild mosquito population. The district also says that the mosquito species isn’t native to the Keys, nor is it an integral food source for other animals.
Dengue fever is a viral disease that inflicts severe flulike symptoms — the joint pain is so severe its nickname is “breakbone fever.” It isn’t fatal, but victims are then susceptible at subsequent exposures to dengue hemorrhagic fever, which can be.
“It’s very uncomfortable. You ache all over; you have a terrible fever,” said Joel Biddle, a Key West resident whose dengue fever symptoms lasted more than a week in 2009.
Mr. Biddle is among those concerned about the Key West trial. He worries the modified genetic material will somehow be passed to humans or the ecosystem, and he wants more research done. He and other Key West residents also chafe at the fact that the project was in the works long before it was made public late last year.
Only female mosquitoes bite, so the modified genetic material wouldn’t be passed on to humans, mosquito control and Oxitec officials said. They also say they’re being transparent about their data and the trial.
Real estate agent Mila de Mier has collected more than 117,700 signatures on a petition she posted on Change.org against the trial. Most come from outside the Keys, which Ms. de Mier says shows that tourists don’t support the mosquito control district.
“We are dependent here on our tourists, and people from all over the country have been sending the message,” Ms. de Mier said.
A University of Florida professor who studies mosquito control said Oxitec’s technology works and evidence from the company’s experiments elsewhere show it can control mosquito populations, but it’s not clear whether its methods are as effective at controlling the risk of disease transmission.
Phil Lounibos of the Florida Medical Entomology Laboratory also said it would take repeated releases of modified mosquitoes for the program to work, and the public outcry against genetically modified organisms, even when it’s irrational, may be insurmountable.
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