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Benin

Research: Large-scale production of the malaria vector biocontrol agent Romanomermis iyengari (Nematoda: Mermithidae) in Benin, West Africa

January 17, 2015 - 15:13 -- Bart G.J. Knols
Author(s): 
Thiery BC Alavo, Ayaba Z Abagli, Rafael Pérez-Pacheco, Edward G Platzer
Reference: 
MWJ2015, 6, 1

The mermithid nematode Romanomermis iyengari is one of several natural control alternatives to synthetic pesticides for mosquito suppression. The commonly used mass rearing procedure of R. iyengari involves the use of coarse sand as a substrate for nematode maturation and oviposition. The coarse sand technique gives excellent nematode productivity in North America. However, under West African climatic conditions, this technique generates relatively lesser amounts of infectious worms. We evaluated coconut coir fibres as a replacement for coarse sand to improve yields in large-scale production of R. iyengari in Benin, West Africa. Culex quinquefasciatus was the host for the nematodes, and mosquitoes were blood-fed on chickens. Four days after blood feeding, egg rafts were collected and transferred into trays, each containing 2 l of water. The mosquito larvae were fed with fish food. When the mosquito larvae reached the second instar, preparasites (J2) were added (3 J2/larva) to the incubation trays. Eight days after infection, post-parasitic juveniles were separated from the water containing dead mosquito larvae and other debris using sieves and needles; 2 g of them were deposited in containers with coarse sand or coconut coir fibres and water. Three hours later, the water was drained, the jars covered and stored for eight weeks, after which J2 abundance was determined, using a total of 320 containers for each substrate. The abundance of J2 preparasites was also assessed 3-5 months after storage to determine the impact of long-term storage on the J2 yield. Results. After 2 months storage, 2 g of post-parasites (~457 females and 583 males) yielded an average of 559,300±6094 J2 and 155,818±4427 J2 per container for coconut fibres and for coarse sand, respectively. During long-term storage, yields of J2 on coconut fibres substrate slowly decreased from 442,180±9322 J2 (3 months storage) to 163,632±12,416 J2 per container (5 months storage). On coarse sand substrate, the yield was relatively low and decreased from 49,812±1200 J2 at 3 months storage to 3046±229 J2 at 5 months storage. Under West African climatic conditions, coconut coir fibres gave significantly higher preparasitic nematode yields than the coarse sand technique. 

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Implications of insecticide resistance for malaria vector control with long-lasting insecticidal nets: evidence from health facility data from Benin

February 13, 2019 - 16:18 -- Open Access
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Author(s): 
Filémon T. Tokponnon, Yolande Sissinto, John Bradley, et al.
Reference: 
Malaria Journal 2019 18:37, 11 February 2019

This study found no association between frequency of resistance and incidence of clinical malaria in an area where ITNs are the principal form of vector control.

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Small-scale field evaluation of the efficacy and residual effect of Fludora® Fusion (mixture of clothianidin and deltamethrin) against susceptible and resistant Anopheles gambiae populations from Benin, West Africa

January 2, 2019 - 15:34 -- Open Access
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Author(s): 
Fiacre R. Agossa, Gil G. Padonou, Martin C. Akogbeto, et al.
Reference: 
Malaria Journal 2018 17:484, 29 December 2018

Both the Fludora® Fusion combination and clothianidin alone showed very good and lasting efficacy for IRS against resistant Anopheles with some residual benefit provided by the combination.

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Fear and rumours regarding placental biopsies in a malaria-in-pregnancy trial in Benin

November 20, 2018 - 14:50 -- Open Access
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Author(s): 
Adélaïde Compaoré, Susan Dierickx, Koen Peeters Grietens, et al.
Reference: 
Malaria Journal 2018 17:425, 15 November 2018

Transdisciplinary social science research designs should accompany the implementation of the trial.

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Baseline entomologic data on malaria transmission in prelude to an indoor residual spraying intervention in the regions of Alibori and Donga, Northern Benin, West Africa

October 31, 2018 - 15:27 -- Open Access
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Author(s): 
Albert S. Salako, Idelphonse Ahogni, Martin C. Akogbeto, et al.
Reference: 
Malaria Journal 2018 17:392, 29 October 2018

This study showed the heterogeneous and various nature of malaria epidemiology in Northern Benin.

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Home treatment and use of informal market of pharmaceutical drugs for the management of paediatric malaria in Cotonou, Benin

October 16, 2018 - 14:25 -- Open Access
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Author(s): 
Edwige Apetoh, Marina Tilly, Carine Baxerres and Jean-Yves Le Hesran
Reference: 
Malaria Journal 2018 17:354, 10 October 2018

This study highlights the link between worse economic conditions and accessibility to medical care as one of the main factors of malaria home treatment and drug purchase in IMPD, even if those two phenomena need to be understood apart.

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NOT Open Access | High folate levels are not associated with increased malaria risk but with reduced anaemia rates in the context of high-dosed folate supplements and intermittent preventive treatment against malaria in pregnancy with sulphadoxine–pyrimet

June 5, 2018 - 14:50 -- NOT Open Access
Author(s): 
Violeta Moya-Alvarez, Smaila Ouédraogo, Manfred Accrombessi and Michel Cot
Reference: 
Tropical Medicine & International Health banner, Volume23, Issue6, June 2018

High folate levels are not associated with increased malarial risk in a prospective longitudinal cohort in the context of both iron and high‐dosed folate supplements and IPTp.

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Evaluation of the knowledge and attitude of pharmacists about the national malaria control policy in southern Benin

June 6, 2017 - 15:40 -- Open Access
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Author(s): 
Habib Ganfon, Giraud Ekanmian, Louis Amoussou, Emilie Daniel-Garcia and Aurel Constant Allabi
Reference: 
Malaria Journal 2017 16:231, 31 May 2017

Dispensing practices within the studied pharmacies from Cotonou and Porto-Novo were not in adequacy with the NMCP guidelines for uncomplicated malaria, which is a striking weakness in the training of drug providers on key elements of the guidelines for managing malaria.

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Soluble human leukocyte antigen -G during pregnancy and infancy in Benin: Mother/child resemblance and association with the risk of malaria infection and low birth weight

February 22, 2017 - 14:55 -- Open Access
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Author(s): 
Tania C. d’Almeida, Ibrahim Sadissou, André Garcia, et el.
Reference: 
PLoS ONE 12(2): e0171117

Human leukocyte antigen (HLA) G is a tolerogenic molecule involved in the maternal-fetal immune tolerance phenomenon.

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WHO cone bio-assays of classical and new-generation long-lasting insecticidal nets call for innovative insecticides targeting the knock-down resistance mechanism in Benin

February 15, 2017 - 17:31 -- Open Access
Author(s): 
Marius Allossogbe, Virgile Gnanguenon, Martin Akogbeto, et al.
Reference: 
Malaria Journal 2017 16:77, 15 February 2017

This study showed that the new-generation LLINs treated with pyrethroids and PBO showed better efficacy compared to conventional LLINs.

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