Transmission des plasmodies humaines dans les villages de N'gatty et d’Allaba en milieu lagunaire de Côte d'Ivoire

Fofana, D.; Koné, A. B.; Konan, Y. L.; Konan, K. L.; Doannio, J. M. C.; N'Goran, E K

doi:10.1684/san.2010.0183

Cited by 4 publications

(3 citation statements)

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“…nili group) identified in Kérou live in sympatry in this savannah zone. This finding is similar to those of several authors in West Africa [30, 31].…”

Section: Discussionsupporting

confidence: 93%

Involvement of Anopheles nili in Plasmodium falciparum transmission in North Benin

Ossè

Tokponnon

Padonou

et al. 2019

Malar J

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Background Several studies carried out in Benin have shown the involvement of Anopheles gambiae sensu lato (s.l.), the Anopheles funestus group in malaria transmission, but none of them reported the contribution of the Anopheles nili group to the transmission of this disease. The current study investigated the question through an entomological cross-sectional survey performed in Northern Benin. Methods Mosquito samplings were performed in September and October 2017 in 4 villages located in two districts: Bambaba and Wodara (Kérou district) and, Péhunco 2 and Béké (Péhunco district). The collections were carried out indoors and outdoors using human landing catches (HLC) to assess the human biting rate (HBR) and pyrethrum spray catches (PSC) to evaluate the blood feeding rate and the blood meal origin using the ELISA test. All collected mosquitoes were morphologically identified and, the polymerase chain reaction (PCR) technique was used for molecular identification of sibling species of An. gambiae s.l., An. funestus group and An. nili group sporozoite index (SI) was also assessed by the ELISA test. Results Overall, An. gambiae s.l., An. funestus group and An. nili group were the three vectors found in the study area. A significantly higher human biting rate (HBR) was recorded in An. nili group (5 bites/human/night) compared to An. funestus group (0.656 bites/human/night) in the Kérou district (p < 0.0001). Anopheles gambiae s.l. displayed the highest HBR (26.19 bites/human/night) in the same district. The entomological inoculation rate (EIR) was 1.875 infected bites/human/month in An. nili group against 13.05 infected bites/human/month in An. gambiae s.l. and 0.938 infected bites/human/month in An. funestus group in Kérou. In Péhunco, the EIR was 1.02 infected bites/human/month in An. gambiae s.l. PCR results showed that An. nili sensu stricto (s.s.) and An. funestus s.s. were the only species of the An. nili and An. funestus groups, respectively. The anthropophagic character of An. gambiae s.l. was also highlighted. Conclusion This study provides useful information on the contribution of An. nili group as secondary vector to malaria transmission in northern Benin. Broader studies must also be carried out in a larger study area to assess the involvement of other Anopheles species to malaria transmissi...

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“…nili group) identified in Kérou live in sympatry in this savannah zone. This finding is similar to those of several authors in West Africa [30, 31].…”

Section: Discussionsupporting

confidence: 93%

Involvement of Anopheles nili in Plasmodium falciparum transmission in North Benin

Ossè

Tokponnon

Padonou

et al. 2019

Malar J

View full text Add to dashboard Cite

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“…The Guinean forest-savannah mosaic belt extends across the middle of the country from the East to the West and the northern part belongs to the Sudanian savannah. All these ecological conditions contribute to the proliferation of many malaria vector species across the country [28]. This contributes to the stability of malaria transmission throughout the year, with peaks during the rainy season [29].…”

Section: Introductionmentioning

confidence: 99%

Assessing Anopheles vector species diversity and transmission of malaria in four health districts along the borders of Côte d’Ivoire

Yokoly

Zahouli

Small

et al. 2021

Malar J

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Background Although malaria and Anopheles mosquito vectors are highly prevalent in Côte d’Ivoire, limited data are available to help understand the malaria vector density and transmission dynamics in areas bordering the country. To address this gap, the Anopheles mosquito species diversity, the members of the Anopheles gambiae complex and the transmission of malaria were assessed in four health districts along the borders of Côte d’Ivoire. Methods From July 2016 through December 2016 and July 2017 through December 2017, adult Anopheles mosquitoes were collected in four health districts of Côte d’Ivoire (Aboisso, Bloléquin, Odienné and Ouangolodougou) using standardized window exit trap (WET) and pyrethrum knockdown spray collection (PSC) methods. The collected mosquitoes were identified morphologically at species level and the members of the An. gambiae complex were separated using short interspersed nuclear element-based polymerase chain reaction (SINE-PCR). Anopheles gambiae sensu lato (s.l.), Anopheles funestus s.l. and Anopheles nili specimens were analysed for malaria Plasmodium parasite detection using the cytochrome oxidase I gene (COX-I), and malaria prevalence among human population through local Ministry of Health (MoH) statistical yearbooks. Results A total of 281 female Anopheles were collected in Aboisso, 754 in Bloléquin, 1319 in Odienné and 2443 in Ouangolodougou. Seven Anopheles species were recorded including An. gambiae s.l. (94.8–99.1%) as the main vector, followed by An. funestus s.l. (0.4–4.3%) and An. nili (0–0.7%). Among An. gambiae s.l., Anopheles coluzzii represented the predominant species in Aboisso (89.2%) and Bloléquin (92.2%), while An. gambiae sensu stricto (s.s.) was the major species in Odienné (96.0%) and Ouangolodougou (94.2%). The Plasmodium sporozoite infection rate in An. gambiae s.l. was highest in Odienné (11.0%; n = 100) followed by Bloléquin (7.8%, n = 115), Aboisso (3.1%; n = 65) and Ouangologoudou (2.5%; n = 120). In An. funestus s.l., Plasmodium falciparum sporozoite infection rate was estimated at 6.2% (n = 32) in Bloléquin, 8.7% (n = 23) in Odienné. No An. funestus s.l. specimens were found infected with P. falciparum sporozoite infection in Ouangolodougou and Aboisso. No P. falciparum sporozoite was detected in An. nili specimens in the four health districts. Among the local human populations, malaria incidence was higher in Odienné (39.7%; n = 45,376) and Bloléquin (37.6%; n = 150,205) compared to that in Ouangolodougou (18.3%; n = 131,629) and Aboisso (19.7%; n = 364,585). Conclusion Anopheles vector species diversity, abundance and Plasmodium sporozoite infection were high within the health districts along the borders of the country of Côte d’Ivoire, resulting in high malaria transmission among the local populations. Anopheles gambiae s.l. and An. funestus s.l. were found to be highly infected with Plasmodium in the health districts of Bloléquin and Odienné where higher malaria incidence was observed than the other districts. This study provides important information that can be used to guide Côte d’Ivoire National Malaria Control Programme for vector control decision-making, mainly in districts that are at the country borders.

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“…The Guinean forest-savannah mosaic belt extends across the middle of the country from east to west and the northern part belongs to the Sudanian savannah. All these ecological conditions contribute to the proliferation of many species of mosquitoes responsible for malaria transmission malaria across the country [28]. This contributes to the maintenance of malaria transmission throughout the year, with peaks during the rainy season [29].…”

Section: Introductionmentioning

confidence: 99%

Assessing Anopheles Vector Species Diversity and Transmission of Malaria in Cross-Border Areas of Côte d'Ivoire

Yokoly

Zahouli

Small

et al. 2020

Preprint

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Background Although malaria and Anopheles mosquito vectors are highly prevalent in Côte d'Ivoire, data are still lacking on disease transmission dynamics in cross-border areas. To address this lack of information, we assessed the Anopheles mosquito vector species diversity, the An. gambiae complex members and the transmission of malaria in four cross-border areas of Côte d'Ivoire.Method From July 2016 to December 2017, we collected adult Anopheles mosquitoes in four cross-border health districts of Côte d’Ivoire (Aboisso, Bloléquin, Odienné and Ouangolodougou) using standardized window exit trap (WET) and pyrethrum knockdown spray collection (PSC) methods. We identified collected mosquitoes morphologically at species level and An. gambiae complex members using short interspersed nuclear element-based polymerase chain reaction (SINE-PCR). We analyzed An. gambiae, An. funestus and An. nili specimens for malaria Plasmodium parasite infection using the cytochrome oxidase I gene (COX-I), and malaria prevalence among human population through local Ministry of Health (MoH) statistical yearbooks.Results In total, 281, 754, 1,319 and 2,443 specimens of Anopheles adult females were collected in Aboisso, Bloléquin, Odienné and Ouangolodougou, respectively. We found seven Anopheles species dominated by An. gambiae s.l. (94.8%-99.1%), followed by An. funestus (0.4%-4.3%) and An. nili (0%-0.7%). Among An. gambiae s.l., An. coluzzii predominated in Aboisso (89.2%) and Bloléquin (92.2%), while An. gambiae s.s. was present at the highest frequency in Odienné (96.0%) and Ouangolodougou (94.2%). The Plasmodium sporozoite infection rate in An. gambiae s.l. was highest in Odienné (11.0 %; n = 100) followed by Bloléquin (7.8%, n = 115), Aboisso (3.1%; n = 65) and Ouangologoudou (2.5%; n = 120). In An. funestus, P. falciparum sporozoite infection rate was estimated at 6.2% (n = 32) in Bloléquin, 8.7% (n = 23) in Odienné. No An. funestus specimens were found infected with P. falciparum sporozoite infection in Ouangolodougou and Aboisso. No P. falciparum sporozoite was detected in An. nili specimens in the four health districts. Among the local human populations, malaria prevalence rate was higher in Odienné (39.7%; n = 45,376) and Bloléquin (37.6%; n = 150,205) compared with that in Ouangolodougou (18.3%; n = 131,629) and Aboisso (19.7%; n = 364,585).Conclusion In cross-border health districts of Côte d’Ivoire, Anopheles vector species diversity and abundance and Plasmodium sporozoite infection were high, thus resulting in high transmission of malaria to local populations. An. gambiae and An. funestus were found to be highly Plasmodium-infected in the health districts of Bloléquin and Odienné where malaria prevalence among humans was particularly high. This study provides important information that can be used to guide national malaria control programme strategies in Côte d’Ivoire, mainly in cross-border settings.

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Transmission des plasmodies humaines dans les villages de N'gatty et d’Allaba en milieu lagunaire de Côte d'Ivoire

Cited by 4 publications

References 0 publications

Involvement of Anopheles nili in Plasmodium falciparum transmission in North Benin

Involvement of Anopheles nili in Plasmodium falciparum transmission in North Benin

Assessing Anopheles vector species diversity and transmission of malaria in four health districts along the borders of Côte d’Ivoire

Assessing Anopheles Vector Species Diversity and Transmission of Malaria in Cross-Border Areas of Côte d'Ivoire

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