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Experimental huts trial of the efficacy of pyrethroids/piperonyl butoxide (PBO) net treatments for controlling multi-resistant populations of Anopheles funestus s.s. in Kpomè, Southern Benin
- Source :
- Wellcome Open Research
- Publication Year :
- 2018
- Publisher :
- F1000 Research, Ltd., 2018.
-
Abstract
- Background:Insecticides resistance inAnophelesmosquitoes limits Long-Lasting Insecticidal Nets (LLIN) used for malaria control in Africa, especially Benin. This study aimed to evaluate the bio-efficacy of current LLINs in an area whereAn. funestuss.l.andAn. gambiaehave developed multi-resistance to insecticides, and to assess in experimental huts the performance of a mixed combination of pyrethroids and piperonyl butoxide (PBO) treated nets on these resistant mosquitoes.Methods:The study was conducted at Kpomè, Southern Benin. The bio-efficacy of LLINs againstAn. funestus and An. gambiaewas assessed using the World Health Organization (WHO) cone and tunnel tests. A released/recapture experiment following WHO procedures was conducted to compare the efficacy of conventional LLINs treated with pyrethroids only and LLINs with combinations of pyrethroids and PBO. Prior to huts trials, we confirmed the level of insecticide and PBO residues in tested nets using high performance liquid chromatography (HPLC).Results:Conventional LLINs (Type 2 and Type 4) have the lowest effect against local multi-resistantAn. funestus s.s. and An. coluzziipopulations from Kpomè. Conversely, when LLINs containing mixtures of pyrethroids and PBO (Type 1 and Type 3) were introduced in trial huts, we recorded a greater effect against the two mosquito populations (P < 0.0001). Tunnel test withAn. funestus s.s.revealed mortalities of over 80% with this new generation of LLINs (Type 1 and Type 3),while conventional LLINs produced 65.53 ± 8.33% mortalities for Type 2 and 71.25 ±7.92% mortalities for Type 4. Similarly, mortalities ranging from 77 to 87% were recorded with the local populations ofAn. coluzzii.Conclusion:This study suggests the reduced efficacy of conventional LLINs (Pyrethroids alone) currently distributed in Benin communities whereAnophelespopulations have developed multi-insecticide resistance. The new generation nets (pyrethroids+PBO) proved to be more effective on multi-resistant populations of mosquitoes.
- Subjects :
- 0301 basic medicine
Piperonyl butoxide
LLINs
Anopheles gambiae
030231 tropical medicine
Medicine (miscellaneous)
wa_395
wc_765
An. coluzzii
General Biochemistry, Genetics and Molecular Biology
World health
wa_110
PBO
Toxicology
03 medical and health sciences
chemistry.chemical_compound
0302 clinical medicine
An. funestus s.s
parasitic diseases
medicine
Pyrethroids
Multi-resistance controlling
biology
Anopheles funestus
Anopheles
wa_240
Articles
biology.organism_classification
medicine.disease
Resistant tuberculosis
3. Good health
wc_750
030104 developmental biology
chemistry
qx_510
qx_515
Malaria control
Malaria
Research Article
Subjects
Details
- Language :
- English
- ISSN :
- 2398502X
- Database :
- OpenAIRE
- Journal :
- Wellcome Open Research
- Accession number :
- edsair.doi.dedup.....c287865e3ade7a3d356b1a87fca2f013