New technique uncovers hidden insecticide resistance

Sep 23, 2010
Researchers at LSTM have developed a new technique which encourages the female Anopheles funestus mosquitoes to lay eggs which are then reared into adult mosquitoes to provide sufficient numbers to determine levels of insecticide resistance and to characterise the underlying mechanisms. This image shows eggs being laid using the new technique. Credit: John Morgan, LSTM

A new technique pioneered at Liverpool School of Tropical Medicine (LSTM) is improving the detection and monitoring of insecticide resistance in field populations of an important malaria-carrying mosquito.

Researchers at LSTM, led by Dr Charles Wondji have developed a new technique which encourages the female Anopheles funestus to lay which are then reared into adult mosquitoes to provide sufficient numbers to determine levels of insecticide resistance and to characterise the underlying mechanisms.

Explaining the significance, John Morgan, who designed the technique, said: "Malaria is the main cause of death in Uganda with some 12 million cases recorded annually. The Ministry of Health relies heavily on insecticide treated nets and spraying to control mosquitoes. The effectiveness of those control programmes depends on the ability to detect and monitor insecticide resistance.

"The An. funestus mosquito is difficult to collect and rear from the field and hence published studies of insecticide resistance in this species are limited. This new forced egg laying technique encourages the females to lay eggs which we were then able to rear into viable populations.

"This allowed us to study levels of resistance to particular and in doing so, we have been able to find the first documented resistance to pyrethroid/DDT insecticides in East Africa. This will enable researchers to map the distribution of this resistance and allow the Ministry of Health to modify its vector control programme, thereby increasing its effectiveness and helping to reduce the transmission of malaria."

Explore further: NY and NJ say they will require Ebola quarantines

More information: The paper is published in PLoS ONE.

Provided by Liverpool School of Tropical Medicine

not rated yet
add to favorites email to friend print save as pdf

Related Stories

New insecticide created for mosquitoes

Jul 18, 2007

French scientists have developed an effective insecticide-repellent compound that can be used against mosquitoes resistant to current chemicals.

Netting mosquitoes to prevent malaria

Mar 21, 2008

Michigan State University scientist Ned Walker is taking on one of the biggest killers in the world—malaria. And he believes he can help win the battle to save lives, especially the lives of children.

Recommended for you

NY and NJ say they will require Ebola quarantines

9 hours ago

The governors of New Jersey and New York on Friday ordered a mandatory, 21-day quarantine for all doctors and other arriving travelers who have had contact with Ebola victims in West Africa.

WHO: Mali case may have infected many people

14 hours ago

The World Health Organization says a toddler who brought Ebola to Mali was bleeding from her nose during her journey on public transport and may have infected many people.

Two US nurses are declared cured of Ebola

15 hours ago

Two American nurses were declared cured of Ebola on Friday, and one was healthy enough to leave the hospital and meet President Barack Obama for a hug.

User comments : 0