Mosquito trials raise hopes of defeating dengue

NHA TRANG – Hundreds dead in the Philippines; a threefold increase of cases in Vietnam; hospitals overrun in Malaysia, Myanmar and Cambodia – dengue is ravaging Southeast Asia this year due in part to rising temperatures and low immunity to new strains. one group of scientists is rolling out trials to breed dengue-resistant bugs in a bid to tackle one of the world’s leading mosquito-borne illnesses, raising hopes the untreatable disease can finally be beaten.

The World Mosquito Program (WMP) has pioneered a method where male and female Aedes aegypti mosquitoes are infected with the disease-resistant bacteria called Wolbachia before being released into the wild.

In a matter of weeks, baby mosquitoes are born carrying Wolbachia, which acts as a disease buffer for the bugs – making it harder for them to pass on not only dengue, but Zika, chikungunya and yellow fever.

First trialled in northern Australia, it’s been tested in nine countries around the globe, including in Vietnam where early results are promising.

“We have seen a remarkable reduction of dengue cases after the release,” explained Nguyen Binh Nguyen, project coordinator for WMP in Nha Trang.

His team set free around half a million Wolbachia-infected mosquitoes last year in Vinh Luong, a crowded dengue-prone district in southern Vietnam.

Since the trials, dengue cases are down 86 percent in Vinh Luong compared to nearby resort town Nha Trang.