Cargando…

An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad

INTRODUCTION: malaria is a major public health issue in Africa. In Chad in 2019, with 955,243 confirmed cases and 2,955 deaths, malaria is the main cause of consultations. A longitudinal entomological study was conducted in Moïssala Health District. Its objective was to assess the impact of indoor r...

Descripción completa

Detalles Bibliográficos
Autores principales: Kodindo, Israël Demba, Kalnoné, Elise Yangalbé, Oumar, Adoum Mahamat, Tchonfinet, Moundai, Fadel, Amen Nakebang, Abba, Brahim Adef, Belemel, Djédion, Mallaye, Péka, Hinzoumbe, Clément Kerah
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The African Field Epidemiology Network 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8728807/
https://www.ncbi.nlm.nih.gov/pubmed/35059109
http://dx.doi.org/10.11604/pamj.2021.40.189.27903
_version_ 1784626808504713216
author Kodindo, Israël Demba
Kalnoné, Elise Yangalbé
Oumar, Adoum Mahamat
Tchonfinet, Moundai
Fadel, Amen Nakebang
Abba, Brahim Adef
Belemel, Djédion
Mallaye, Péka
Hinzoumbe, Clément Kerah
author_facet Kodindo, Israël Demba
Kalnoné, Elise Yangalbé
Oumar, Adoum Mahamat
Tchonfinet, Moundai
Fadel, Amen Nakebang
Abba, Brahim Adef
Belemel, Djédion
Mallaye, Péka
Hinzoumbe, Clément Kerah
author_sort Kodindo, Israël Demba
collection PubMed
description INTRODUCTION: malaria is a major public health issue in Africa. In Chad in 2019, with 955,243 confirmed cases and 2,955 deaths, malaria is the main cause of consultations. A longitudinal entomological study was conducted in Moïssala Health District. Its objective was to assess the impact of indoor residual spraying with 80% bendiocarb wettable powder on malaria transmission. METHODS: two areas were defined for the study: Dembo, located in the sprayed area, Moïssala, in the untreated area. Two sampling methods were used: pyrethrum spray catches and human landing catches. RESULTS: sixteen sessions of human landing catches totalling 32 man-nights were conducted and 160 rooms/site were sprayed. Two anopheles were captured in Dembo and 547 in Moïssala. In Moïssala, An coluzzii, An funestus and An rufipes were captured in the rooms and on human bait. An colluzzii and An funestus were captured in pyrethrum spray catches in Dembo. The anophelian human landing catches density was zero in Dembo while it was 8.38 bites/man/night in outdoor and 10.06 bits/man/night in indoor in Moïssala. Only An coluzziiwas found infected in human landing catches and sporozoite index of was 7.46% (10/134) in outdoor and 7.45% (12/161) in indoor in Moïssala. Malaria transmission was estimated at 0.63 infected bites/man/night in outdoor and 0.75 infected bites/man/night in indoor i.e. 229.95 infected bites/man/year in outdoor and 273.75 infected bites/man/year. In pyrethrum spray catches, An coluzzii and An rufipes were the two species found infected in Moïssala with sporozoite indices of 6.70% (23/343) and 20% (2/10) respectively. However, in Dembo, neither of the two captured mosquitoes was found infected. CONCLUSION: the indoor residual spraying campaign in the eastern zone of Moïssala has led to the collapse of vectors´ density and aggressiveness. However, its evaluation over a short period of time is not sufficient to assess the impact of malaria transmission in this constant and endemic malaria zone.
format Online
Article
Text
id pubmed-8728807
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher The African Field Epidemiology Network
record_format MEDLINE/PubMed
spelling pubmed-87288072022-01-19 An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad Kodindo, Israël Demba Kalnoné, Elise Yangalbé Oumar, Adoum Mahamat Tchonfinet, Moundai Fadel, Amen Nakebang Abba, Brahim Adef Belemel, Djédion Mallaye, Péka Hinzoumbe, Clément Kerah Pan Afr Med J Research INTRODUCTION: malaria is a major public health issue in Africa. In Chad in 2019, with 955,243 confirmed cases and 2,955 deaths, malaria is the main cause of consultations. A longitudinal entomological study was conducted in Moïssala Health District. Its objective was to assess the impact of indoor residual spraying with 80% bendiocarb wettable powder on malaria transmission. METHODS: two areas were defined for the study: Dembo, located in the sprayed area, Moïssala, in the untreated area. Two sampling methods were used: pyrethrum spray catches and human landing catches. RESULTS: sixteen sessions of human landing catches totalling 32 man-nights were conducted and 160 rooms/site were sprayed. Two anopheles were captured in Dembo and 547 in Moïssala. In Moïssala, An coluzzii, An funestus and An rufipes were captured in the rooms and on human bait. An colluzzii and An funestus were captured in pyrethrum spray catches in Dembo. The anophelian human landing catches density was zero in Dembo while it was 8.38 bites/man/night in outdoor and 10.06 bits/man/night in indoor in Moïssala. Only An coluzziiwas found infected in human landing catches and sporozoite index of was 7.46% (10/134) in outdoor and 7.45% (12/161) in indoor in Moïssala. Malaria transmission was estimated at 0.63 infected bites/man/night in outdoor and 0.75 infected bites/man/night in indoor i.e. 229.95 infected bites/man/year in outdoor and 273.75 infected bites/man/year. In pyrethrum spray catches, An coluzzii and An rufipes were the two species found infected in Moïssala with sporozoite indices of 6.70% (23/343) and 20% (2/10) respectively. However, in Dembo, neither of the two captured mosquitoes was found infected. CONCLUSION: the indoor residual spraying campaign in the eastern zone of Moïssala has led to the collapse of vectors´ density and aggressiveness. However, its evaluation over a short period of time is not sufficient to assess the impact of malaria transmission in this constant and endemic malaria zone. The African Field Epidemiology Network 2021-11-29 /pmc/articles/PMC8728807/ /pubmed/35059109 http://dx.doi.org/10.11604/pamj.2021.40.189.27903 Text en Copyright: Israël Demba Kodindo et al. https://creativecommons.org/licenses/by/4.0/The Pan African Medical Journal (ISSN: 1937-8688). This is an Open Access article distributed under the terms of the Creative Commons Attribution International 4.0 License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research
Kodindo, Israël Demba
Kalnoné, Elise Yangalbé
Oumar, Adoum Mahamat
Tchonfinet, Moundai
Fadel, Amen Nakebang
Abba, Brahim Adef
Belemel, Djédion
Mallaye, Péka
Hinzoumbe, Clément Kerah
An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad
title An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad
title_full An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad
title_fullStr An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad
title_full_unstemmed An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad
title_short An entomological survey in the Sudanese Guinean environmental transition zone after indoor residual spraying, Chad
title_sort entomological survey in the sudanese guinean environmental transition zone after indoor residual spraying, chad
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8728807/
https://www.ncbi.nlm.nih.gov/pubmed/35059109
http://dx.doi.org/10.11604/pamj.2021.40.189.27903
work_keys_str_mv AT kodindoisraeldemba anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT kalnoneeliseyangalbe anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT oumaradoummahamat anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT tchonfinetmoundai anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT fadelamennakebang anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT abbabrahimadef anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT belemeldjedion anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT mallayepeka anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT hinzoumbeclementkerah anentomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT kodindoisraeldemba entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT kalnoneeliseyangalbe entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT oumaradoummahamat entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT tchonfinetmoundai entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT fadelamennakebang entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT abbabrahimadef entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT belemeldjedion entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT mallayepeka entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad
AT hinzoumbeclementkerah entomologicalsurveyinthesudaneseguineanenvironmentaltransitionzoneafterindoorresidualsprayingchad