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Flightless mosquitoes may curb dengue
Genetically altered mosquitoes that cannot fly may help slow the spread of dengue fever and could be a harmless alternative to chemical insecticides, according to scientists.

The team from the US and United Kingdom genetically altered mosquitoes to produce flightless females. They say spreading these defective mosquitoes could suppress native, disease-spreading mosquitoes within six to nine months.

There is no vaccine or treatment for dengue fever, which is endemic in the tropics and is particularly prevalent in Asia and the western Pacific. The disease, which causes severe flu-like symptoms and can kill, is spread through the bite of infected female Aedes aegypti mosquitoes.

"This could be the first in a new wave of products that might supplant insecticides," says researcher Anthony James of the University of California, Irvine.

There are an estimated 50 million cases of dengue fever each year and about 2.5 billion people - two-fifths of the world's population - are at risk, mostly in Africa and southeast Asia, according to the World Health Organization.
Grounded

James's team, including a group from the British biotechnology firm Oxitec, altered mosquito genes to disrupt development of the insects' wing muscle.

The genetic modification grounded only the virus-carrying females and did not affect the males' ability to fly, they write in the Proceedings of the National Academy of Science.

The idea would be to distribute tens of thousands of eggs that would hatch out these genetically modified mosquitoes, which would consist of flightless females and seemingly unaffected males.

The males, which can fly but do not bite or convery disease, mate with wild females and pass on their genes to the next generation.

Over time there would be far more genetically modified mosquitoes than natives, so they could in effect blot out the dengue-carrying population.

"We stack the numbers in our favour by releasing a lot of these things," says James.

"The technology is completely species-specific, as the released males will mate only with females of the same species," adds Oxitec's Luke Alphey, who led the study.

Alphey says using genetically modified mosquitoes would be an environmentally friendly alternative to chemical insecticides and would be egalitarian.

"All people in the treated areas are equally protected, regardless of their wealth, power or education," he says.

Both Oxitec and Oxford University have applied for a patent.

The current work is focused on mosquitoes that carry dengue fever, but the researchers say it could be adapted to other species that spread malaria and West Nile fever.

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