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Evaluation of the Anti-Salivary IgG Response Specific to Anopheles Vectors of Malaria in Children under Five Seen in Health Care Settings in Areas of Low and High Insecticide Resistance in Southern Benin

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Advances in Infectious Diseases 2023年第2期13卷 269-282页

作者： Tokponnon T. Filémon ossè razaki Noukpo Herbert Legba Thibaut Koukpo Zinsou Come Oke Mariam Fassinou Arsène Akakpo Evelyne Fassinou Hector Padonou Gil Germain Remoue Franck Kinde-Gazard Dorothée Akogbeto Martin Ecole Polytechnique d’Abomey-Calavi Université d’Abomey-Calavi Abomey-Calavi Bénin Centre de Recherche Entomologique de Cotonou (CREC) Cotonou Benin Ministry of Health Cotonou Benin Centre Béninois de la Recherche Scientifique et de l’Innovation (CBRSI) Cotonou Bénin Ecole de Gestion et d’Exploitation des Systèmes d’Elevage Université Nationale d’Agriculture Kétou Benin National Malaria Control Programme Cotonou Benin Faculté des Sciences de la Santé de l’Université d’Abomey Calavi Cotonou Benin Institut de Recherche pour le Développement (IRD) Montpellier France

The widespread use of long-lasting insecticidal nets (LLINs) is a major intervention method for malaria control. While coverage of LLINs has increased, there is a need for information on the operational effectiveness of nets deployed in the field in the context of malaria vector resistance to insecticides used for impregnation. The development of specific anti-malarial biomarkers to assess exposure to mosquito bites is an important development in evaluations. The aim of this study was to characterize the human IgG antibody response to Anopheles gSG6-P1 saliva, a salivary peptide antigen previously shown to be a relevant biomarker of human exposure to Anopheles bites, in order to assess the LLINs under field conditions in areas of low and high vector resistance to insecticides. We analyzed data from 240 randomly selected children ( 0.05). Furthermore, the same finding was observed for antibody expression in children whether or not they used LLINs on the day before the survey (p = 0.7724). Similarly, gender and especially age, major factors of variation in the adaptive immune response, did not have a significant effect on IgG expression.

关键词： Case-Controls LLINs Malaria Morbidity Pyrethroids Resistance Antibodies Bite Exposure Biomarkers Benin

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Evaluation at the Level of Health Facilities, of the Protective Efficacy of LLINs in Children under 5 Years Old from Localities of Low and High Resistance of Vectors to Pyrethroid Insecticides in Benin in West Africa

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Advances in Infectious Diseases 2022年第1期12卷 57-73页

作者： Tokponnon Tatchémè Filémon ossè razaki Arthur Sovi Wakpo Abel Hounto Ogouyémi Aurore Sissinto Yolande Adechoubou Alioun Houansou Télesphore Oke Mariam Kinde-Gazard Dorothée Massougbodji Achille Akogbeto Martin Centre de Recherche Entomologique de Cotonou (CREC) Cotonou Benin Ministry of Health Cotonou Benin Centre Béninois de le Recherche Scientifique et de l’Innovation Cotonou Benin Ecole Polytechnique d’Abomey-Calavi Université d’Abomey-Calavi Abomey-Calavi Bénin Ecole de Gestion et d’exploitation des systèmes d’élevage Université Nationale d’Agriculture Kétou Benin Faculté des Sciences de la Santé de l’Université d’Abomey Calavi Cotonou Benin National Malaria Control Programme Cotonou Benin World Health Organization Cotonou Benin

Context: The resistance to pyrethroids in malaria vectors continues to grow in Africa and could therefore compromise or reduce substantially the effectiveness of LLINs in preventing malaria. It is therefore of paramount importance to evaluate the protective efficacy of LLINs in children sleeping in areas of vector resistance to insecticides in order to draw lessons for future interventions. This study assesses the effect of the use of LLINs on malaria morbidity in clusters of low and high resistance of vectors to pyrethroids. Methods: This is a cross-sectional case-control study with one control for one case that was conducted in the communes of Kétou, Ifangni, Kétou, and Pobè in the Plateau department of southern Benin. The use of LLINs and malaria morbidity was measured and compared in children from clusters of low and high vector resistance to insecticides. In each commune, 30 cases and 30 controls were recruited for a total of 240 children under 5 years of age from villages with low and high insecticide resistance. Results: According to the localities of origin of the children, of all parents of children surveyed, 169 (70.4%) asserted the children slept under an LLIN the day before they arrived at the health center. This rate represents 70.8% (85 children) among the cases and 70.0% (84 children) among the controls without significant difference (p = 0.8). The use of LLINs the day before the survey, the frequency of their use during the two weeks preceding the day of the survey, their availability at the household level, the use of other tools for protection against mosquito bites are the same in the two groups of children (cases and controls) (p > 0.05) as well in low and high resistance villages. On the other hand, the parasite prevalence, the splenomegaly and the geometric means of the parasite densities, are significantly higher in the cases than in the controls (p Conclusion: The evaluation of epidemiological indicators in children under five years old at th

关键词： Case-Controls LLINs Malaria Morbidity Pyrethroids Resistance Benin

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Study of the efficacy of a Wheaton coated bottle with permethrin and deltamethrin in laboratory conditions and a WHO impregnated paper with bendiocarb in field conditions

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Asian Pacific Journal of Tropical Biomedicine 2014年第6期4卷 492-497页

作者： Nazaire Azoun Roseric Azondekon Rock Akpon Virgile Gnanguenon razaki osse Alex Asidi Martin Akogbeto Centre de Recherche Entomologique de Cotonou(CREC) Faculte des Sciences et Techniques Universite d'Abomey Calavi University of Massachusetts Amherst London School of Hygiene and Tropical Medecine

Objective:To determine the efficacy of WHO impregnated paper and CDC coated bottle based on number of storage days and number of limes of consecutive use,in the assessment of insecticide vector susceptibility tests in laboratory and field ***:Larvae and pupae of Anopheles gambiae *** were collected from the breeding sites in Seme-Kpodji and Cotonou districts in Southern Benin in April 2013 during the first rainy *** gambiae *** were also collected from the breeding sites in Parakou district in Northern Benin in May 2013 at the beginning of the rainy *** tests were done using impregnated paper with bendiocarb(0.1%)following WHO protocol and stock solutions of permethrin(21.5 ug per bottle)and deltamethrin(12.5 ug per bottle)following CDC protocol on unfed female mosquitoes aged 2-5 days *** bioassays were repeated a certain number of *** temperature and relative humidity were monitored and recorded during the susceptibility ***:This study showed that a WHO impregnated paper with bendiocarb could be used four times during four consecutive days in field *** a Wheaton coated bottle with permethrin or deltamethrin,they could be used at least three limes during four consecutive days in laboratory ***:The day storage and the number of times that a WHO impregnated paper and a CDC coated bottle maintained their efficacy are useful in the assessment of insecticide vectors susceptibility tests.

关键词： Efficacy Coated bottle Impregnated paper Insecticide Laboratory conditions Field conditions

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Evaluation of Malaria Transmission and Vector Control Strategies in the Dry Season in the Cotonou V Health Zone, Benin, West Africa

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Advances in Entomology 2023年第3期11卷 156-171页

作者： Tokponnon Filémon osse razaki Zannou Ahissou Robert Franck Alapini Marlène Sare Dabou Zoulkifilou Houessinon Festus Gounou Yerima Idayath Sominahoun André Akogbeto Martin Centre de Recherche Entomologique de Cotonou Cotonou République du Bénin Ecole Polytechnique d’Abomey-Calavi Université d’Abomey-Calavi Abomey-Calavi Republique du Bénin Ministère de la Santé Cotonou Republique du Bénin Cercle d’Action pour un Développement Durable ONG Abomey-Calavi Republique du Bénin Ecole de Gestion et d’Exploitation des Systèmes d’Elevage Université Nationale d’Agriculture Kétou Republique du Bénin

The anarchic urbanization of certain African cities favors the multiplication of the malaria parasite. Thus, the urgent mobilization of African cities is essential to combat this health risk. It is, therefore, with the objective of contributing to the investigation of problem areas that the present study evaluates malaria transmission and vector control strategies in the Cotonou V health zone in particular. This is a cross-sectional study taking into account four neighborhoods, including Wologuèdè, Sainte Rita, Gbèdjromèdé and the area around Etoile Rouge. Two nocturnal captures on voluntary humans and the method of spray were carried out in the dry season from December 2021 to February 2022. On the captured Anopheles, the ELISA Circum-Sporozoite Protein test was performed to determine the infectivity and calculate some transmission parameters. Finally, we conducted a survey using the second stage sampling method with one step to ask selected households about their knowledge of vector control methods, their use and the physical integrity of LLINs. We collected 2386 culicidae of which the majority was Culex quinquefasciatus. After the ELISA test, the 29 Anopheles tested, showed no infectivity, i.e. an EIR of 0 pi/h/n. In addition, 99% of the populations in the Cotonou V area use LLINs to protect themselves. However, coils, door and window screens, aerosol sprays, skin and household repellents, and periodic indoor spraying were used. Finally, the majority of nets observed had T1 tears, but there were also T2, T3 and T4 nets (P-value = 0.0). This study confirms that malaria transmission during the dry season in the Cotonou V health zone is almost negligible but not non-existent. Also, populations are exposed to the nuisance of Culex quinquefasciatus mosquitoes continuously throughout the year.

关键词： Anopheles Transmission Urban Malaria Cotonou V Health Zone Vector Control

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Evaluation of the Effectiveness of “Electron Go out Mosquito Small Lamp” in Disease Vector Mosquito Control Benin West Africa

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Advances in Entomology 2023年第2期11卷 95-104页

作者： Tatchémè Filémon Tokponnon Phidias Gbaguidi Zannou Robert Franck razaki osse Sébastien Koudenoukpo Mazaire Bata Sare Dabou Zoulkifilou Houessinon Festus Gounou Idayath Martin C. Akogbeto Centre de Recherche Entomologique de Cotonou Ministère de la Santé Cotonou Bénin Ecole Polytechnique d’Abomey Calavi Université d’Abomey-Calavi Abomey-Calavi Bénin Ministère de la Santé Cotonou Bénin Ecole de Gestion et d’Exploitation des Systèmes d’Elevage Université Nationale d’Agriculture Kétou Bénin

In the context of mosquito control, a plethora of devices have been put on the market. The effectiveness of these devices is not always proven, but some have interesting principles that have the potential to be a good means of mosquito control. Among these interesting devices are the photonic traps. We have carried out nightly captures of mosquitoes on human baits in the presence and absence of the device. These captures were made during the rainy season in the localities of Zogbadjè and Mènontin. The captures were made under the same atmospheric conditions at the same locations at 5-day intervals. These captures were made twice per house, indoors and outdoors, with one blank capture without the device and one capture with the device. The captured mosquitoes were identified and classified by genus and their aggressiveness determined by calculating the biting rate. A total of 845 mosquitoes were captured during these captures with 296 mosquitoes captured indoors without the device and 132 mosquitoes with the device present. This represents a decrease of 55.40% in culicidae density. Furthermore, a significant decrease was observed in aggressiveness, from 49 to 22 bites per man per night (b/m/n) with the use of the device. This decrease is even more important for nocturnal species such as Anopheles spp. whose aggressiveness decreased by 90%. The present study confirms the effectiveness of the “Electron go out mosquito small lamp” in reducing Culicidae density and mosquito aggression even in the presence of chemotactic interference. However, this study was limited in time and focused only on the ability of the device to reduce mosquito numbers and did not assess its epidemiological efficacy. It is therefore important to extend the work to examine the influence of the use of this device on population health and the occurrence of mosquito-borne diseases, particularly malaria.

关键词： Mosquito Control Electron Go Out Mosquito Effectiveness Culicidae Density Phototactism Bénin

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