Navigation Links
Insecticide and Repellent Combo Effective in Eliminating Malarial Mosquitoes

Researchers have revealed that combining a non-pyrethroid insecticide, propoxur, and a repellent, N,N-diethyl toluamide may prove to be an effective insecticide-repellent synergy against mosquitoes responsible for malaria transmission to humans.

A combination of the two had proved to be much more effective than the straightforward addition of their respective properties. Mosquito nets soaked with this mixture had a lethal power and irritant effect that inhibited the mosquitoes from biting. Moreover, the mosquitoes are hit by a powerful paralysing action, known as the knockdown effect, on contact with the mixture.

The mortality rates determined were satisfactory, in that they equalled those obtained by using deltamethrin, a commonly used synthetic pyrethroid, highly effective against mosquitoes.

The researchers tested two mixtures composed of a non-pyrethroid insecticide of the organophosphate family, combined with either a standard repellent, DEET, or with a new-generation synthetic repellent. Both of these mixtures show a strong synergy in the resulting lethal and paralysing effects on the mosquitoes. However, only the association between the insecticide and the standard repellent produced a synergistic effect that inhibited the mosquito from taking its blood feed.

A synergistic effect was also observed with regard to the treatments residual efficacy, which is several months longer than that of either agent applied alone. The advantage of the synergistic property of these combinations is enhanced by the fact that it significantly reduced the necessary effective doses against the mosquitoes (about 6 times that of the insecticide applied alone), to attain an efficacy equivalent to that of deltamethrin.

The nets treated with the two mixtures in the laboratory were subsequently tested in field trials, in the rice-growing area 40 km North of Bobo-Dioulasso, in Burkina Faso. This area has the specif icity of harbouring two different forms of Anopheles gambiae. The first appears in May and June in the rice-fields. It shows no resistance to pyrethroids. The second emerges in September and October in puddles left by monsoon rains. These do show resistance to these insecticides.

As expected, the usual pyrethroid-treated nets turned out to be effective only against non-resistant mosquitoes of the first population. Conversely, the nets pre-soaked with non-pyrethroidrepellent combinations proved excellent protection for the people of the local villages, whatever the population of mosquitoes present.

Nevertheless, their residual efficacy (about 15 days) in real conditions did not match the researchers expectations. The team consequently envisage working in conjunction with a company able to devise a system for encapsulating the mixture to prolong the residual life of treated mosquito nets.

The efficacy of these mixtures between organophosphates and repellents therefore opens up a new pathway towards controlling pyrethroid-resistant malaria vectors. In the long term, the researchers plan to test their method on mosquitoes resistant to two other types of insecticide utilized against malaria transmission: organophosphates and carbamates.


'"/>




Related medicine news :

1. Leukaemia May Be Triggered By Insecticides
2. Health of Mothers and Children Show Improvement after Use of Insecticide-Treated Bed Nets
3. Clothes Treated with Insecticide Reduces the Risk of Malarial Infection
4. Insecticide-treated Bed Nets to Combat Malaria in Older Children and Adults
5. Electronic Mosquito Repellents Fail to Prevent Malaria Transmission
6. Drug Combo Works Better for children with ADHD, Tics
7. Scanning Combo Helps Detect Lung Cancer
8. Relief From Asthma With New Combo Therapy
9. Calcium-Vitamin D Combo For Reduced Fracture Risk
10. Drug Combo Improves Performance Of Multiple Sclerosis Drug
11. Alcohol-illusion: Alcohol and Energy Drinks Combo, Maintains Sobriety?
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:10/13/2017)... ... October 13, 2017 , ... The Visiting Nurse Association (VNA) of Somerset Hills ... specialty vendors and unique items from across the nation, this holiday-themed event will raise ... offered by the VNA. The boutique will be open Saturday, November 4 (10:00 ...
(Date:10/13/2017)... ... October 13, 2017 , ... Global Healthcare Management’s 4th Annual Kids Fun Run ... This free event, sponsored by Global Healthcare Management’s CEO, Jon Letko, is aimed ... geared towards children of all ages; it is a non-competitive, non-timed event, which is ...
(Date:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... ... will be giving viewers the lowdown on sciatica in a new episode of ... that focuses on current events and innovation and investigates each subject in-depth with ...
(Date:10/13/2017)... ... ... “The Journey: From the Mountains to the Mission Field”: the story of a missionary ... Journey: From the Mountains to the Mission Field” is the creation of published author, ... ages and currently teaches a class of ladies at her church, which she has ...
(Date:10/12/2017)... ... 2017 , ... First Healthcare Compliance (FHC), an industry leader ... range of technology and learning solutions at the 68th Annual American Healthcare Association ... held October 14–18, 2017 at the Mandalay Bay Resort in Las Vegas, Nevada. ...
Breaking Medicine News(10 mins):
(Date:9/18/2017)... KALAMAZOO, Mich. , Sept. 18, 2017  PMD ... OptiMed Specialty Pharmacy of Kalamazoo, Mich. ... strategic hub service that expedites and streamlines patient and ... Spiro PD 2.0, and wellness management services.  ... medical device used to measure lung function for a ...
(Date:9/13/2017)... , Sept. 13, 2017   OrthoAtlanta has been ... Atlanta Football Host Committee (AFHC) for the 2018 College Football ... 8, 2018, at Mercedes-Benz Stadium in Atlanta, Georgia ... the AFHC "I,m In" campaign, participating in many activities leading ... ...
(Date:9/12/2017)... N.J. , Sept. 12, 2017  Consumer reviews on the ... Hearing as the number one company for hearing aids, ranking ... and fifteen other brands. ... Embrace Hearing Named #1 by Consumers For Hearing Aids ... Embrace Hearing is an online store that provides high ...
Breaking Medicine Technology: