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Background: A better understanding of vector distribution and malaria transmission dynamics at a local scale is essential for implementing and evaluating effectiveness of vector control strategies. Through the data gathered in the framework of a cluster randomized controlled trial (CRT) evaluating the In2Care (Wageningen, Netherlands) Eave Tubes strategy, the distribution of the Anopheles vector, their biting behaviour and malaria transmission dynamics were investigated in Gbêkê region, central Côte d'Ivoire.

Methods: From May 2017 to April 2019, adult mosquitoes were collected monthly using human landing catches (HLC) in twenty villages in Gbêkê region. Mosquito species wereidentified morphologically. Monthly entomological inoculation rates (EIR) were estimated by combining the HLC data with mosquito sporozoite infection rates measured in a subset of Anopheles vectors using PCR. Finally, biting rate and EIR fluctuations were fit to local rainfall data to investigate the seasonal determinants of mosquito abundance and malaria transmission in this region.

Results: Overall, Anopheles gambiae, Anopheles funestus, and Anopheles nili were the three vector complexes found infected in the Gbêkê region, but there was a variation in Anopheles vector composition between villages. Anopheles gambiae was the predominant malaria vector responsible for 84.8% of Plasmodium parasite transmission in the area. An unprotected individual living in Gbêkê region received an average of 260 [222-298], 43.5 [35.8-51.29] and 3.02 [1.96-4] infected bites per year from An. gambiae, An. funestus and An. nili, respectively. Vector abundance and malaria transmission dynamics varied significantly between seasons and the highest biting rate and EIRs occurred in the months of heavy rainfall. However, mosquitoes infected with malaria parasites remained present in the dry season, despite the low density of mosquito populations.

Conclusion: These results demonstrate that the intensity of malaria transmission is extremely high in Gbêkê region, especially during the rainy season. The study highlights the risk factors of transmission that could negatively impact current interventions that target indoor control, as well as the urgent need for additional vector control tools to target the population of malaria vectors in Gbêkê region and reduce the burden of the disease.

Titel:	Anopheles vector distribution and malaria transmission dynamics in Gbêkê region, central Côte d'Ivoire.
Autor/in / Beteiligte Person:	Koffi, AA ; Camara, S ; Ahoua Alou, LP ; Oumbouke, WA ; Wolie, RZ ; Tia, IZ ; Sternberg, ED ; Yapo, FHA ; Koffi, FM ; Assi, SB ; Cook, J ; Thomas, MB ; N'Guessan, R
Link:	Zum Volltext
Zeitschrift:	Malaria journal, Jg. 22 (2023-06-22), Heft 1, S. 192
Veröffentlichung:	London : BioMed Central, [2002-, 2023
Medientyp:	academicJournal
ISSN:	1475-2875 (electronic)
DOI:	10.1186/s12936-023-04623-1
Schlagwort:	Animals Adult Humans Cote d'Ivoire epidemiology Mosquito Vectors parasitology Seasons Anopheles parasitology Malaria prevention & control Bites and Stings
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Randomized Controlled Trial; Journal Article Language: English [Malar J] 2023 Jun 22; Vol. 22 (1), pp. 192. <i>Date of Electronic Publication: </i>2023 Jun 22. MeSH Terms: Anopheles* / parasitology ; Malaria* / prevention & control ; Bites and Stings* ; Animals ; Adult ; Humans ; Cote d'Ivoire / epidemiology ; Mosquito Vectors / parasitology ; Seasons References: Proc Natl Acad Sci U S A. 2020 Oct 6;117(40):24900-24908. (PMID: 32929020) ; BMC Infect Dis. 2018 Aug 22;18(1):413. (PMID: 30134861) ; Parasite. 2019;26:40. (PMID: 31298995) ; Philos Trans R Soc Lond B Biol Sci. 2021 Feb 15;376(1818):20190815. (PMID: 33357057) ; Malar J. 2011 Dec 20;10:378. (PMID: 22185615) ; Malar J. 2019 Apr 29;18(1):152. (PMID: 31036025) ; Ann Trop Med Parasitol. 2011 Jan;105(1):13-24. (PMID: 21294945) ; J Med Entomol. 2010 Jan;47(1):28-31. (PMID: 20180305) ; Ann Trop Med Parasitol. 2010 Mar;104(2):109-21. (PMID: 20406578) ; Lancet. 2014 May 17;383(9930):1739-47. (PMID: 24559537) ; Vector Borne Zoonotic Dis. 2021 Aug;21(8):593-601. (PMID: 34129392) ; J Med Entomol. 2020 May 4;57(3):908-914. (PMID: 31785095) ; Cold Spring Harb Perspect Med. 2017 Oct 3;7(10):. (PMID: 28490534) ; Acta Trop. 2010 Dec;116(3):167-72. (PMID: 20727338) ; J Infect Dis. 2021 Apr 27;223(12 Suppl 2):S171-S186. (PMID: 33906224) ; Trends Parasitol. 2011 Feb;27(2):91-8. (PMID: 20843745) ; Emerg Infect Dis. 2007 Feb;13(2):199-206. (PMID: 17479880) ; R Soc Open Sci. 2017 Mar 8;4(3):160969. (PMID: 28405386) ; J Clin Microbiol. 2005 May;43(5):2435-40. (PMID: 15872277) ; Trop Med Parasitol. 1995 Dec;46(4):263-9. (PMID: 8826108) ; Lancet. 2021 Feb 27;397(10276):805-815. (PMID: 33640067) ; Parasit Vectors. 2018 Jan 8;11(1):19. (PMID: 29310704) ; Malar J. 2014 Aug 23;13:330. (PMID: 25149656) ; Parasit Vectors. 2021 Sep 15;14(1):473. (PMID: 34526109) ; J Infect Dis. 2021 Apr 27;223(12 Suppl 2):S61-S80. (PMID: 33906221) ; Parasit Vectors. 2010 Dec 03;3:117. (PMID: 21129198) ; J Med Entomol. 2020 Jul 4;57(4):1254-1261. (PMID: 31982912) ; BMC Public Health. 2018 Jul 18;18(1):894. (PMID: 30021543) ; Parasit Vectors. 2021 Jan 20;14(1):64. (PMID: 33472661) ; Elife. 2016 Aug 22;5:. (PMID: 27547988) ; PLoS One. 2011 Apr 29;6(4):e19473. (PMID: 21559301) ; Malar J. 2013 Feb 18;12:65. (PMID: 23419192) ; Acta Trop. 2007 Mar;101(3):207-16. (PMID: 17359927) ; Parasit Vectors. 2016 Jul 04;9(1):385. (PMID: 27378358) ; Curr Opin Insect Sci. 2019 Aug;34:48-54. (PMID: 31247417) ; Malar J. 2021 Mar 4;20(1):127. (PMID: 33663515) ; PLoS Med. 2010 Aug 10;7(8):. (PMID: 20711482) ; Malar J. 2018 Aug 22;17(1):307. (PMID: 30134912) ; PLoS One. 2020 Aug 3;15(8):e0236920. (PMID: 32745085) ; PLoS Med. 2014 Mar 18;11(3):e1001619. (PMID: 24642791) ; Malar J. 2012 Feb 09;11:40. (PMID: 22321336) ; Ecohealth. 2012 Dec;9(4):455-70. (PMID: 23212728) ; Malar J. 2011 Apr 09;10:80. (PMID: 21477321) ; Am J Trop Med Hyg. 2003 Feb;68(2):169-76. (PMID: 12641407) ; Malar J. 2013 May 04;12:151. (PMID: 23641777) ; Med Vet Entomol. 2005 Mar;19(1):27-37. (PMID: 15752174) ; PLoS One. 2021 Oct 11;16(10):e0255321. (PMID: 34634069) ; Malar J. 2021 Oct 18;20(1):409. (PMID: 34663359) ; Malar J. 2009 Oct 12;8 Suppl 1:S2. (PMID: 19818169) ; Parasit Vectors. 2018 Mar 2;11(1):118. (PMID: 29499720) ; Am J Trop Med Hyg. 1999 Jul;61(1):109-13. (PMID: 10432066) ; Lancet Planet Health. 2022 Mar;6(3):e257-e269. (PMID: 35278391) ; PLoS One. 2013 Dec 16;8(12):e82387. (PMID: 24358177) Contributed Indexing: Keywords: Anopheles vector; Côte d’Ivoire; Insecticide resistance; Malaria transmission Entry Date(s): Date Created: 20230622 Date Completed: 20230626 Latest Revision: 20230701 Update Code: 20231215 PubMed Central ID: PMC10288776

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Anopheles vector distribution and malaria transmission dynamics in Gbêkê region, central Côte d'Ivoire.