Volume 5, Issue 1, January 2020, Page: 1-13
Influence of Climatic Factors on Aggression and Infectivity of Anopheles in the Districts the Indoor Residual Spray (IRS) in Northern Benin, West Africa
André Sominahouin, Cotonou Entomological Research Center (CREC), Cotonou, Benin; Department of Geography and Spatial Planning, University of Abomey, Calavi, Benin
Germain Gil Padonou, Cotonou Entomological Research Center (CREC), Cotonou, Benin; Faculty of Science and Technology, University of Abomey, Calavi, Benin
Rodrigue Landéhou, Department of Geography and Spatial Planning, University of Abomey, Calavi, Benin
Albert Sourou Salako, Cotonou Entomological Research Center (CREC), Cotonou, Benin
Hermann Sagbohan, Cotonou Entomological Research Center (CREC), Cotonou, Benin
Idelphonse Ahogni, Cotonou Entomological Research Center (CREC), Cotonou, Benin
Sylvain Lokonon, Faculty of Economics and Management, University of Abomey, Calavi, Benin
Razaki Osse, Cotonou Entomological Research Center (CREC), Cotonou, Benin
Arsène Fassinou, Cotonou Entomological Research Center (CREC), Cotonou, Benin
Bénoît Assogba, Institute of Public Health Research, University of Abomey, Calavi, Benin
Fiacre Agossa, Cotonou Entomological Research Center (CREC), Cotonou, Benin
Fortuné Dagnon, US President’s Malaria Initiative, US Agency for International Development, Cotonou, Benin
Christophe Houssou, Department of Geography and Spatial Planning, University of Abomey, Calavi, Benin
Martin Akogbéto, Cotonou Entomological Research Center (CREC), Cotonou, Benin; Faculty of Science and Technology, University of Abomey, Calavi, Benin
Received: Nov. 28, 2019;       Accepted: Dec. 18, 2019;       Published: Jan. 6, 2020
DOI: 10.11648/j.ajlm.20200501.11      View  31      Downloads  19
Abstract
Background: Climate variability influence the diversity and abundance of malaria vectors and thereby on malaria transmission dynamics. Examine its effect on Anopheles parameters involved in transmission may predict the potential malaria hotspot as a right target for its control intervention strategies. Here, we investigated the influence of meteorological parameters on the aggressiveness and infectivity of Anopheles in two health districts zones where IRS has been extended in Northern Benin. Mosquito collections were carried out using human landing catches to evaluate rates of aggression and infectivity in twelve villages. Concomitantly, meteorological data from synoptic stations of Benin and neighbouring countries were collected in 2016-2017. The spatial distribution of infective bites of An. gambiae is characterized by an intense aggression in the rural villages of the study area. Analysis of variances showed significant HBR difference according to the period but not according to the locality. However, the same analysis carried out with the infectivity rate shows no significant difference according to the period and the locality. In addition, the number of infective bites per man per month is higher in August and October, and the climatic parameters that have mainly favoured aggression are wind speed, humidity, sunshine and temperature. Indeed, the peak of wind speed is concentrated around 1.2 km / h and in September (5 km / h) whereas the aggressiveness score of Anopheles in the region is greater than 10 infective bites per man a year. Malaria transmission by Anopheles is influenced by climatic factors. The climate observed in the districts where IRS was extended in northern Benin has a real impact on Anopheles density and weakens current and future vector control strategies. This could lead to a series of modifications observed in anopheline populations just after IRS implementation ranging from a tendency to exophagy, from a decrease in the rate of blood-feeding to changes in the time, and change in aggressiveness. These phenomena most likely contribute to the sustainability of malaria transmission despite vector control measures.
Keywords
Infectivity, Aggression, Climate, Anopheles gambiae (s.l.), IRS, Benin
To cite this article
André Sominahouin, Germain Gil Padonou, Rodrigue Landéhou, Albert Sourou Salako, Hermann Sagbohan, Idelphonse Ahogni, Sylvain Lokonon, Razaki Osse, Arsène Fassinou, Bénoît Assogba, Fiacre Agossa, Fortuné Dagnon, Christophe Houssou, Martin Akogbéto, Influence of Climatic Factors on Aggression and Infectivity of Anopheles in the Districts the Indoor Residual Spray (IRS) in Northern Benin, West Africa, American Journal of Laboratory Medicine. Vol. 5, No. 1, 2020, pp. 1-13. doi: 10.11648/j.ajlm.20200501.11
Copyright
Copyright © 2020 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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