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2. Effectiveness of pyriproxyfen-pyrethroid and chlorfenapyr-pyrethroid long-lasting insecticidal nets (LLINs) compared with pyrethroid-only LLINs for malaria control in the third year post-distribution: a secondary analysis of a cluster-randomised controlled trial in Benin

Author

Accrombessi, Manfred, Cook, Jackie, Dangbenon, Edouard, Sovi, Arthur, Yovogan, Boulais, Assongba, Landry, Adoha, Constantin J, Akinro, Bruno, Affoukou, Cyriaque, Padonou, Germain Gil, Kleinschmidt, Immo, Messenger, Louisa A, Rowland, Mark, Ngufor, Corine, Akogbeto, Martin C, and Protopopoff, Natacha

Published
2024
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3. Field performance of three mosquito collection methods for assessing the entomological efficacy of dual-active ingredient long-lasting insecticidal nets

Author

Yovogan, Boulais, Adoha, Constantin J., Akinro, Bruno, Accrombessi, Manfred, Dangbénon, Edouard, Sidick, Aboubakar, Ossè, Razaki, Padonou, Gil G., Messenger, Louisa A., Fassinou, Arsène, Sagbohan, Hermann W., Agbangla, Clément, Djènontin, Armel, Odjo, Esdras M., Ngufor, Corine, Cook, Jackie, Protopopoff, Natacha, Sovi, Arthur, and Akogbéto, Martin C.

Published
2023
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4. What can be learned from the residual efficacy of three formulations of insecticides (pirimiphos-methyl, clothianidin and deltamethrin mixture, and clothianidin alone) in large-scale in community trial in North Benin, West Africa?

Author

Odjo, Esdras Mahoutin, Salako, Albert Sourou, Padonou, Germain Gil, Yovogan, Boulais, Adoha, Constantin Jésukèdè, Adjottin, Bruno, Sominahouin, André Aimé, Sovi, Arthur, Osse, Razaki, Kpanou, Casimir D., Sagbohan, Hermann W., Djenontin, Armel, Agbangla, Clement, and Akogbeto, Martin C.

Published
2023
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6. Efficacy of pyriproxyfen-pyrethroid long-lasting insecticidal nets (LLINs) and chlorfenapyr-pyrethroid LLINs compared with pyrethroid-only LLINs for malaria control in Benin: a cluster-randomised, superiority trial

Author

Accrombessi, Manfred, Cook, Jackie, Dangbenon, Edouard, Yovogan, Boulais, Akpovi, Hilaire, Sovi, Arthur, Adoha, Constantin, Assongba, Landry, Sidick, Aboubacar, Akinro, Bruno, Ossè, Razaki, Tokponnon, Filémon, Aïkpon, Rock, Ogouyemi-Hounto, Aurore, Padonou, Germain Gil, Kleinschmidt, Immo, Messenger, Louisa A, Rowland, Mark, Ngufor, Corine, Protopopoff, Natacha, and Akogbeto, Martin C

Published
2023
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7. Efficacy of pyrethroid-pyriproxyfen and pyrethroid-chlorfenapyr nets on entomological indicators of malaria transmission: third year of a randomised controlled trial in Benin

Author

Sovi, Arthur, primary, Yovogan, Boulais, additional, Adoha, Constantin J., additional, Akinro, Bruno, additional, Accrombessi, Manfred, additional, Dangbénon, Edouard, additional, Assongba, Landry, additional, Salako, Albert Sourou, additional, Padonou, Germain Gil, additional, Messenger, Louisa A., additional, Ngufor, Corine, additional, Cook, Jackie, additional, Protopopoff, Natacha, additional, and Akogbéto, Martin C., additional

Published
2024
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8. Did the prolonged residual efficacy of clothianidin products lead to a greater reduction in vector populations and subsequent malaria transmission compared to the shorter residual efficacy of pirimiphos-methyl?

Author

Odjo, Esdras Mahoutin, primary, Akpodji, Christian S. T., additional, Djènontin, Armel, additional, Salako, Albert Sourou, additional, Padonou, Gil Germain, additional, Adoha, Constantin Jésukèdè, additional, Yovogan, Boulais, additional, Adjottin, Bruno, additional, Tokponnon, Filémon T., additional, Osse, Razaki, additional, Agbangla, Clement, additional, and Akogbeto, Martin C., additional

Published
2024
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9. Diversity and ecological niche model of malaria vector and non-vector mosquito species in Covè, Ouinhi, and Zangnanado, Southern Benin.

Author

Adoha, Constantin Jésukèdè, Sovi, Arthur, Padonou, Germain Gil, Yovogan, Boulais, Akinro, Bruno, Accrombessi, Manfred, Dangbénon, Edouard, Sidick, Aboubakar, Ossè, Razaki, Tokponon, Tachémè Filémon, Odjo, Esdras Mahoutin, Koukpo, Come Z., Fassinou, Arsène, Missihoun, Antoine A., Sominanhouin, André, Messenger, Louisa A., Agboho, Prudenciène A., Akpodji, Serge, Ngufor, Corine, and Cook, Jackie

Subjects
*MOSQUITO control, *ECOLOGICAL niche, *ECOLOGICAL models, *MOSQUITO vectors, *MALARIA, *SPECIES distribution, *VECTOR-borne diseases
Abstract

The present study aimed to assess mosquito species diversity, distribution, and ecological preferences in the Covè, Ouinhi, and Zangnanado communes, Southern Benin. Such information is critical to understand mosquito bio-ecology and to focus control efforts in high-risk areas for vector-borne diseases. Mosquito collections occurred quarterly in 60 clusters between June 2020 and April 2021, using human landing catches. In addition to the seasonal mosquito abundance, Shannon's diversity, Simpson, and Pielou's equitability indices were also evaluated to assess mosquito diversity. Ecological niche models were developed with MaxEnt using environmental variables to assess species distribution. Overall, mosquito density was higher in the wet season than in the dry season in all communes. A significantly higher Shannon's diversity index was also observed in the wet season than in the dry seasons in all communes (p < 0.05). Habitat suitability of An. gambiae s.s., An. coluzzii, Cx. quinquefasciatus and Ma. africana was highly influenced by slope, isothermality, site aspect, elevation, and precipitation seasonality in both wet and dry seasons. Overall, depending on the season, the ecological preferences of the four main mosquito species were variable across study communes. This emphasizes the impact of environmental conditions on mosquito species distribution. Moreover, mosquito populations were found to be more diverse in the wet season compared to the dry season. [ABSTRACT FROM AUTHOR]

Published
2024
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10. The frequency of kdr and ace-1 alleles in Anopheles gambiae s.l. before and during indoor residual spraying (IRS) implementation and four years after IRS withdrawal in three districts in Atacora, Benin

Author

Odjo, Esdras Mahoutin, primary, Impoinvil, Daniel, additional, Fassinou, Arsène Jacques Y. H., additional, Padonou, Gil Germain, additional, Aïkpon, Rock, additional, Salako, Albert Sourou, additional, Sominahouin, André Aimé, additional, Adoha, Constantin, additional, Yovogan, Boulais, additional, Osse, Razaki, additional, Oussou, Olivier, additional, Tokponnon, Filémon, additional, Gnanguénon, Virgile, additional, Hassani, Ahmed Saadani, additional, and Akogbeto, Martin C., additional

Published
2024
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11. The evolution of the genetic structure of populations of two species of the Anopheles gambiae s.l. complex using the Kdr gene before and after indoor residual spraying in some agroecological zones of Benin (West Africa)

Author

Koukpo, Come Z., primary, Fassinou, Arsène Jacques Y. H., additional, Ossè, Razaki A., additional, Tokponon, Filemon, additional, Agossa, Fiacre R., additional, Padonou, Germain Gil, additional, Govoetchan, Renaud, additional, Aboubakar, Sidick, additional, Yovogan, Boulais, additional, Odjo, Esdras M., additional, Akpodji, Serge, additional, Adoha, Constantin J., additional, Baba-Moussa, Lamine Saïd, additional, Adégnika, Ayola Akim, additional, Akogbeto, Martin C., additional, and Sezonlin, Michel, additional

Published
2024
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12. Presence of Plasmodium vivax in Anopheles gambiae and absence in other malaria vectors in Cove-Zagnanando-Ouinhi health zone in southern Benin, West Africa

Author

Tokponnon, Tatchémè Filémon, primary, Ossè, Razaki, additional, Yovogan, Boulais, additional, Guidi, Ella, additional, Adoha, Constantin J., additional, Sominanhouin, André, additional, Ahouandjinou, Juvenal, additional, Sidick, Aboubakar, additional, and Akogbeto, Martin C., additional

Published
2024
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13. The impact of pyrethroid-pyriproxyfen and pyrethroid-chlorfenapyr long-lasting insecticidal nets on density of primary malaria vectors Anopheles gambiae s.s. and Anopheles coluzzii in Benin: a secondary analysis of a cluster randomised controlled trial

Author

Yovogan, Boulais, primary, Sovi, Arthur, additional, Djènontin, Armel, additional, Adoha, Constantin J., additional, Akinro, Bruno, additional, Accrombessi, Manfred, additional, Dangbénon, Edouard, additional, Koukpo, Come Z., additional, Affolabi, Zul-Kifl, additional, Agboho, Prudenciène A., additional, Kpanou, Casimir Dossou, additional, Assongba, Landry, additional, Missihoun, Antoine Abel, additional, Tokponnon, Tatchémè Filémon, additional, Agbangla, Clément, additional, Padonou, Germain Gil, additional, Messenger, Louisa A., additional, Ngufor, Corine, additional, Cook, Jackie, additional, Akogbéto, Martin C., additional, and Protopopoff, Natacha, additional

Published
2024
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14. Efficacy of Pyrethroid–Pyriproxyfen and Pyrethroid–Chlorfenapyr Long-Lasting Insecticidal Nets (LLINs) for the Control of Non-Anopheles Mosquitoes: Secondary Analysis from a Cluster Randomised Controlled Trial (cRCT)

Author

Adoha, Constantin J., primary, Sovi, Arthur, additional, Yovogan, Boulais, additional, Akinro, Bruno, additional, Accrombessi, Manfred, additional, Dangbénon, Edouard, additional, Odjo, Esdras M., additional, Sagbohan, Hermann Watson, additional, Kpanou, Casimir Dossou, additional, Padonou, Gil G., additional, Messenger, Louisa A., additional, Agbangla, Clément, additional, Ngufor, Corine, additional, Cook, Jackie, additional, Protopopoff, Natacha, additional, and Akogbéto, Martin C., additional

Published
2023
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15. Trophic preferences of Anopheles coluzzii (Diptera: Culicidae): what implications for malaria vector control in Benin?

Author

Padonou, Germain Gil, primary, Zoungbédji, David Mahouton, additional, Sovi, Arthur, additional, Salako, Albert Sourou, additional, Konkon, Alphonse Keller, additional, Yovogan, Boulais, additional, Adoha, Constantin Jesukèdè, additional, Odjo, Esdras Mahoutin, additional, Osse, Razaki, additional, Sina, Haziz, additional, Govoétchan, Renaud, additional, Kpanou, Casimir Dossou, additional, Sagbohan, Hermann W, additional, Baba-Moussa, Lamine, additional, and Akogbéto, Martin, additional

Published
2023
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16. Distribution and abundance of Aedes aegypti and Aedes albopictus (Diptera: Culicidae) in Benin, West Africa

Author

Padonou, Germain Gil, primary, Konkon, Alphonse Keller, additional, Salako, Albert Sourou, additional, Zoungbédji, David Mahouton, additional, Ossé, Razaki, additional, Sovi, Arthur, additional, Azondekon, Roseric, additional, Sidick, Aboubakar, additional, Ahouandjinou, Juvénal Minassou, additional, Adoha, Constantin Jesukèdè, additional, Sominahouin, André Aimé, additional, Tokponnon, Filemon, additional, Akinro, Bruno, additional, Sina, Haziz, additional, Baba-Moussa, Lamine, additional, and Akogbeto, Martin, additional

Published
2023
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17. Evaluation of the susceptibility of An. gambiae s.l. to deltamethrin, chlorfenapyr and clothianidin in four agricultural areas of Benin

Author

Zoungbédji, David Mahouton, primary, Padonou, Germain Gil, additional, Keller, Alphonse, additional, ., Konkon, additional, Salako, Albert Sourou, additional, Adoha, Constantin Jesukèdè, additional, Fassinou, Arsène Jacques YH, additional, Sina, Haziz, additional, Baba-Mouss, Lamine, additional, and Akogbéto, Martin, additional

Published
2023
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18. Malaria Burden and Associated Risk Factors in an Area of Pyrethroid-Resistant Vectors in Southern Benin

Author

Accrombessi, Manfred, primary, Akogbeto, Martin C., additional, Dangbenon, Edouard, additional, Akpovi, Hilaire, additional, Sovi, Arthur, additional, Yovogan, Boulais, additional, Adoha, Constantin, additional, Assongba, Landry, additional, Ogouyemi-Hounto, Aurore, additional, Padonou, Germain Gil, additional, Thickstun, Charles, additional, Rowland, Mark, additional, Ngufor, Corine, additional, Protopopoff, Natacha, additional, and Cook, Jackie, additional

Published
2022
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19. Assessing Insecticide Susceptibility and Resistance Intensity of Anopheles gambiae s.l. Populations From Some Districts of Benin Republic, West Africa

Author

Kpanou, Casimir Dossou, primary, Sagbohan, Hermann W, additional, Sovi, Arthur, additional, Osse, Razaki, additional, Padonou, Gil G, additional, Salako, Albert, additional, Tokponnon, Filémon, additional, Fassinou, Arsène Jacques, additional, Yovogan, Boulais, additional, Nwangwu, Udoka C, additional, Adoha, Constantin J, additional, Odjo, Esdras Mahoutin, additional, Ahogni, Idelphonse, additional, Sidick, Aboubakar, additional, Saïd Baba-Moussa, Lamine, additional, and Akogbéto, Martin, additional

Published
2022
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20. Intensity and different genes involved in the resistance of An. gambiae s.l. to pyrethroids in four districts representative of the different agricultural production zones of North Benin, West Africa

Author

Sagbohan, Hermann Watson, primary, Kpanou, Casimir D, additional, Padonou, Germain G, additional, Gandonou, Esaie, additional, Osse, Razaki, additional, Sovi, Arthur, additional, Sidick, Aboubakar, additional, Odjo, Aicha N, additional, Adoha, Constantin, additional, Yovogan, Boulais, additional, Salako, Albert S, additional, Ahogni, Idelphonse, additional, Fassinou, Arsène, additional, Sominanhouin, André, additional, Chitou, Saïd, additional, Agbangla, Clément, additional, and Akogbeto, Martin, additional

Published
2022
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21. Impact assessment of CDC bottles treated with a combination of insecticide and synergist on insecticide-resistant Anopheles gambiae populations in Benin

Author

Kpanou, Casimir Dossou, primary, Sagbohan, Hermann W, additional, Padonou, Gil G, additional, Osse, Razaki, additional, Sovi, Arthur, additional, Adoha, Constantin J, additional, Salako, Albert, additional, Agboho, Prudenciènne, additional, Fassinou, Arsène Jacques, additional, Yovogan, Boulais, additional, Ahogni, Idelphonse, additional, Akpodji, Serge, additional, Odjo, Esdras Mahoutin, additional, Affolabi, Zul-kifl, additional, Koukpo, Côme, additional, Baba-Moussa, Lamine Saïd, additional, and Akogbéto, Martin, additional

Published
2022
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22. Trophic preferences of Anopheles coluzzii(Diptera: Culicidae): what implications for malaria vector control in Benin?

Author

Padonou, Germain Gil, Zoungbédji, David Mahouton, Sovi, Arthur, Salako, Albert Sourou, Konkon, Alphonse Keller, Yovogan, Boulais, Adoha, Constantin Jesukèdè, Odjo, Esdras Mahoutin, Osse, Razaki, Sina, Haziz, Govoétchan, Renaud, Kpanou, Casimir Dossou, Sagbohan, Hermann W, Baba-Moussa, Lamine, and Akogbéto, Martin

Abstract

The main objective of the present study is to assess the preferences in terms of vertebrate hosts of Anopheles coluzzii, the main malaria vector in the pastoral area of Malanville, Benin, where rice cultivation and livestock are the main source of income for the populations. Adult mosquitoes were collected through pyrethrum spray catch, and human landing catch in two communes in Benin: Malanville, a pastoral area, and Porto-Novo, a nonpastoral area. Molecular species identification was performed through PCR within the Anopheles gambiaecomplex. Blood meal origin and P. falciparumsporozoite infection were determined using ELISA blood meal and circumsporozoite protein tests, respectively. Overall, 97% of females of An. gambiae s.l.were An. coluzzii, with biting behavior more pronounced outdoors in the pastoral area. In Malanville, the main vertebrate hosts on which females An. coluzziiblood fed were goats (44%), humans (24.29%), bovines (22%), and pigs (1.4%). Our results also showed that single-host blood meals (human: 24.29% or animal: 68%) were mostly observed compared to mixed blood meals (8.58%). The human biting rate (HBR) and P. falciparumsporozoite rate (SR) of An. coluzziiwere 66.25 bites/man/night and 0.77%, respectively. However, in the nonpastoral zone (Porto-novo), 93.98% of samples were An. coluzzii.The latter blood-fed mostly (86.84%) on humans, with an estimated HBR of 21.53 b/m/n and SR of 5.81%. The present study revealed an opportunistic and zoophagic behavior of An. coluzziiin the Malanville area with an overall low mean SR.

Published
2023
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24. Pyrethroid Resistance Intensity in Anopheles gambiae s.l. from Different Agricultural Production Zones in Benin, West Africa.

Author

Sagbohan, Hermann Watson, Kpanou, Casimir D., Sovi, Arthur, Osse, Razaki, Sidick, Aboubakar, Adoha, Constantin, Yovogan, Boulais, Salako, Albert S., Ahogni, Idelphonse, Fassinou, Arsène, Sominanhouin, André, Chitou, Saïd, Padonou, Germain G., Agbangla, Clément, and Akogbeto, Martin

Subjects
INSECTICIDE resistance, ANOPHELES gambiae, PYRETHROIDS, AGRICULTURAL productivity, COTTON growing, INSECTICIDE-treated mosquito nets
Abstract

Agricultural production activities usually occur in Benin with the use of a huge amount of insecticides including pyrethroids for pest control. It is therefore important to regularly monitor pyrethroid resistance intensity in Anopheles gambiae s.l., the main malaria vector. This study was conducted in cereal, cotton, rice growing, and urban market gardening areas throughout the country in 2018 and 2019. Females An. gambiae s.l. field-collected as larvae were exposed to deltamethrin 1 × (0.05%), 2 × (0.1%), 5 × (0.25%), and 10 × (0.5%) and permethrin 1 × (0.75%), 2 × (1.5%), 5 × (3.75%), and 10 × (7.5%). Synergist assays were also performed using World Health Organization articles combining piperonyl butoxide (PBO) (4%) + deltamethrin 1 × and, PBO (4%) + Permethrin 1 × . Molecular species and L1014F kdr mutation were identified using PCR. Expression of metabolic enzymes was also assessed through biochemical tests. After exposure to permethrin and deltamethrin 10 × , An. gambiae s.l. displayed mortality rates <98%. Synergist assays induced significantly higher mortality rates than pyrethroids alone (p < 0.05). An. gambiae s.l. complex was composed of An. gambiae s.s., Anopheles coluzzii, and Anopheles arabiensis, with mean frequency of the L1014F kdr mutation >75%. Overexpression of nonspecific α and β esterases was observed in the cereal, cotton, and urban market gardening areas, while an overexpression of mixed function oxidases was observed in the cotton and rice growing areas. Overall, An. gambiae s.l. showed high resistance intensity to both deltamethrin and permethrin. The synergist and biochemical tests performed suggest that PBO long-lasting insecticidal nets may provide a greater control of pyrethroid-resistant mosquitoes. [ABSTRACT FROM AUTHOR]

Published
2022
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25. Assessing Insecticide Susceptibility and Resistance Intensity of Anopheles gambiaes.l. Populations From Some Districts of Benin Republic, West Africa

Author

Kpanou, Casimir Dossou, Sagbohan, Hermann W, Sovi, Arthur, Osse, Razaki, Padonou, Gil G, Salako, Albert, Tokponnon, Filémon, Fassinou, Arsène Jacques, Yovogan, Boulais, Nwangwu, Udoka C, Adoha, Constantin J, Odjo, Esdras Mahoutin, Ahogni, Idelphonse, Sidick, Aboubakar, Saïd Baba-Moussa, Lamine, and Akogbéto, Martin

Abstract

Pyrethroid resistance is widespread in sub-Saharan Africa. The objective of this study was to assess the insecticide resistance intensity in Anopheles gambiaes.l. (Diptera: Culicidae) in four districts of Benin in order to better understand how pyrethroid-only nets are likely to be effective. Thus, adult females of An. gambiaes.l., reared from field-collected larvae were used for assessing resistance intensity to permethrin and deltamethrin. They were tested at 1×, 5×, and 10× the diagnostic dose, using both WHO susceptibility tube testing and CDC bottle bioassays. Identification of molecular species, as well as of L1014F Kdrand Ace-1Rmutations was performed using the PCR. The level of expression of biochemical enzymes was also evaluated. Overall, moderate to high resistance intensity to permethrin and deltamethrin was observed, irrespective of the testing method. While the L1014F Kdrfrequency was high (>75%), Ace-1Rwas low (≤6%) in An. gambiaes.s. and Anopheles coluzzii, the two predominant species [52% (95% CI: 44.8–59.1) and 45% (95% CI: 38.0–52.2), respectively]. Anopheles arabiensiswas found at very low frequency (3%, 95%CI: 1.1–6.4). For Biochemical analyses, α and β-esterases were over-expressed in all four districts, while mixed-function oxidases (MFOs) were over-expressed in only one. Overall, the two testing methods led to comparable conclusions, though there were a few inconsistencies between them. The moderate-high resistance intensity observed in the study area suggests that dual active-ingredient (AI) long-lasting insecticidal nets (LLINs) may provide better control of insecticide-resistant mosquitoes.

Published
2022
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26. Pyrethroid Resistance Intensity in Anopheles gambiae s.l. from Different Agricultural Production Zones in Benin, West Africa.

Author

Sagbohan HW, Kpanou CD, Sovi A, Osse R, Sidick A, Adoha C, Yovogan B, Salako AS, Ahogni I, Fassinou A, Sominanhouin A, Chitou S, Padonou GG, Agbangla C, and Akogbeto M

Subjects
Africa, Western, Animals, Benin, Female, Insecticide Resistance genetics, Mosquito Control, Mosquito Vectors genetics, Anopheles genetics, Insecticides pharmacology, Malaria veterinary, Pyrethrins pharmacology
Abstract

Agricultural production activities usually occur in Benin with the use of a huge amount of insecticides including pyrethroids for pest control. It is therefore important to regularly monitor pyrethroid resistance intensity in Anopheles gambiae s.l., the main malaria vector. This study was conducted in cereal, cotton, rice growing, and urban market gardening areas throughout the country in 2018 and 2019. Females An. gambiae s.l. field-collected as larvae were exposed to deltamethrin 1 × (0.05%), 2 × (0.1%), 5 × (0.25%), and 10 × (0.5%) and permethrin 1 × (0.75%), 2 × (1.5%), 5 × (3.75%), and 10 × (7.5%). Synergist assays were also performed using World Health Organization articles combining piperonyl butoxide (PBO) (4%) + deltamethrin 1 × and, PBO (4%) + Permethrin 1 × . Molecular species and L1014F kdr mutation were identified using PCR. Expression of metabolic enzymes was also assessed through biochemical tests. After exposure to permethrin and deltamethrin 10 × , An. gambiae s.l. displayed mortality rates <98%. Synergist assays induced significantly higher mortality rates than pyrethroids alone ( p  < 0.05). An. gambiae s.l. complex was composed of An. gambiae s.s., Anopheles coluzzii , and Anopheles arabiensis , with mean frequency of the L1014F kdr mutation >75%. Overexpression of nonspecific α and β esterases was observed in the cereal, cotton, and urban market gardening areas, while an overexpression of mixed function oxidases was observed in the cotton and rice growing areas. Overall, An. gambiae s.l. showed high resistance intensity to both deltamethrin and permethrin. The synergist and biochemical tests performed suggest that PBO long-lasting insecticidal nets may provide a greater control of pyrethroid-resistant mosquitoes.

Published
2022
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