| Titre |
Good performances but short lasting efficacy of Actellic 50 EC Indoor Residual Spraying (IRS) on malaria transmission in Benin, West Africa |
| Auteurs |
Aikpon Rock [1],
Sezonlin Michel [2],
Tokponon Filémon [3],
OKE MARIAM [4],
Oussou Olivier [5],
Oké-Agbo Frédéric [6],
Beach Raymond [0],
Akogbéto Martin C. [0],
|
| Journal: |
Parasites & Vectors |
| Catégorie Journal: |
Internationale |
| Impact factor: |
0 |
| Volume Journal: |
8 |
| DOI: |
|
| Resume |
Background: The National Malaria Control Program (NMCP) has been using pirimiphos methyl for the first time for
indoor residual spraying (IRS) in Benin. The first round was a success with a significant decrease of entomological
indicators of malaria transmission in the treated districts. We present the results of the entomological impact on
malaria transmission. Entomologic parameters in the control area were compared with those in intervention sites.
Methods: Mosquito collections were carried out in three districts in the Atacora-Dongo region of which two were
treated with pirimiphos methyl (Actellic 50EC) (Tanguiéta and Kouandé) and the untreated (Copargo) served as
control. Anopheles gambiae s.l. populations were sampled monthly by human landing catch. In addition, window
exit traps and pyrethrum spray catches were performed to assess exophagic behavior of Anopheles vectors. In the
three districts, mosquito collections were organized to follow the impact of pirimiphos methyl IRS on malaria
transmission and possible changes in the behavior of mosquitoes. The residual activity of pirimiphos methyl in the
treated walls was also assessed using WHO bioassay test.
Results: A significant reduction (94.25%) in human biting rate was recorded in treated districts where an inhabitant
received less than 1 bite of An. gambiae per night. During this same time, the entomological inoculation rate (EIR)
dramatically declined in the treated area (99.24% reduction). We also noted a significant reduction in longevity of
the vectors and an increase in exophily induced by pirimiphos methyl on An. gambiae. However, no significant
impact was found on the blood feeding rate. Otherwise, the low residual activity of Actellic 50 EC, which is three
months, is a disadvantage.
Conclusion: Pirimiphos methyl was found to be effective for IRS in Benin. However, because of the low persistence
of Actellic 50EC used in this study on the treated walls, the recourse to another more residual formulation of
pirimiphos methyl is required. |
| Mots clés |
IRS, Pirimiphos methyl, Efficacy, Malaria, Benin |
| Pages |
1 - 8 |
| Fichier |
 (PDF) |