Patrick Akono Ntonga

• University of Douala

The aim of this study was to describe the wood treatment sector in the cities of Douala and Yaoundé (Cameroon). A total of 319 semi-structured interviews were conducted. The respondents were agents of wood depots, sawmills, hardware stores, and carpentry shops. They were asked about the diversity of products used and their perception of the risks a...

The preservation of non-durable woods such as Ayous through the use of environment friendly products is nowadays a major concern to many tropical wood researchers. The objective of this work was to assess the potentials of Jatropha curcas oil (JCO) alone and in combination with Cymbopogon citratus (JCO + CC), Ocimim basilicum (JCO + OB), and Eucaly...

Background. The effectiveness of Long-Lasting Insecticidal Nets (LLINs) and indoor residual spraying (IRS) in controlling malaria vectors is hampered by the resistance of anopheles to insecticides. A good knowledge of the breeding sites and of the resistance profile of the vectors could facilitate the development of an appropriate control strategy....

Research on the potential of natural substances to improve the durability and preservation of the physical properties of wood is nowadays an important concern. The objective of this work was to characterize and evaluate the effect of an ecological varnish formulated from Jatropha curcas seed oil and vegetable resins on the improvement of the resist...

Background: The present work aimed to highlight process of transmission of tolerance to insecticides in An. gambiae population over several generations. Methodology: The experiment was carried out at the laboratory with the strain of An. gambiae that was continuously raised under laboratory conditions for more than five years. The insecticides used...

Background: Vector control of Malaria is mainly made by using impregnated bed nets and insecticides pulverizations indoor or/and outdoor. Besides, appearance and development of resistance’s phenomenon among mosquito populations to insecticides, constitute a significant obstacle this fighting. Aims: To highlighting a neutralization phenomenon of thr...

The study was conducted in December 2019 and February 2020 in two areas of Ayos city, Akoun (urban site) and Ebabodo (peri-urban site), in order to study the spatial distribution of members of the Anopheles gambiae complex, to determine their resistance status and to investigate the occurrence and distribution of the Kdr mutation. Mosquitoes were c...

The objective of this survey was to evaluate the knowledge, attitudes and practices the head of household had concerning malaria in the urban and rural zones of Kribi. The survey was conducted from 17-27 June 2019 in 3 and 5 quarters respectively in the urban and rural areas of Kribi by means of a standard questionnaire given to the household heads...

Background: Long-lasting insecticidal nets (LLINs) are widely used in sub-Saharan Africa to control the transmission of malaria parasites by Anopheles mosquitoes. However, their operational lifespan depends on numerous factors that are often not considered. This paper investigates on some of these factors likely associated with the rapid breakdown...

Background: Long-lasting insecticidal nets (LLINs) are widely used in sub-Saharan Africa to control the transmission of malaria parasites by Anopheles mosquitoes. However, their operational lifespan depends on numerous factors that are often not considered. This paper investigates on some of the factors likely associated with the rapid breakdown of...

Objective: The implementation of an efficient and successful control strategy requires a recurrent evaluation of the relationship between local populations and the disease. The objective of this study was to assess knowledge, attitudes and practices (KAP) on the treatment and prevention of malaria. Methodology and results: The study was carried out...

Since the outbreak in December 2019, in Wuhan (China) of COVID-19, approved drugs are still lacking and the world is seeking effective treatment. The purpose of this article is to review the medicinal plants with potential to be used as complementary therapies against COVID-19. Bibliographic information was searched in several databases (Google Sch...

La lutte anti moustique au Cameroun repose en grande partie sur une bonne utilisation des mois après la distribution des moustiquaires.L’intégrité physique des MILDA a été d’Anopheles gambiaes.l. non gorgées âgées de deux à cinq jours, élevées en insectarium et MILDA ont été effectués suivant le protocole des tests en cône en utilisant des femelles...

Background In Mvoua, a village situated in a forested area of Cameroon, recent studies have reported high prevalence of Plasmodium falciparum infection among the population. In order to understand factors that can sustain such a high malaria transmission, we investigated the biology of Anopheles vectors and its susceptibility to insecticides, as we...

For a better knowledge of Atractomorpha acutipennis bio-ecology and to facilitate its identification, we studied the morphology, development and reproduction of this grasshopper on Manihot esculenta under laboratory conditions. Five hundred and fifty-one first nymphal stages obtained in the laboratory were reared in cages. Some body parts allowed a...

Mosquito control in Cameroon relies largely on the proper use of Long-Lasting Insecticidal Nets (LLINs). It is necessary to monitor their effectiveness in order to propose corrective measures to improve the strategy. The aim of this work was to determine the physical integrity and effectiveness of LLINs (Interceptor brand) on Anopheles gambiae s.l....

This study assessed the in vitro anti-plasmodial on and larvicidal activity of essential oils from the leaves of Cupressus macrocarpa, Lantana camara and Psidium littorale. The chemical compositions of the different oils were determined. The toxicity of the oils was tested on An. gambiae larvae according to WHO protocol and their in vitro anti-plas...

Les échecs de lutte antipaludique enregistrés ces dernières années sont étroitement liés à la rareté d’informations relatives aux rapports qu’entretiennent les populations avec la maladie. L’objectif de cette enquête était d’évaluer les connaissances, attitudes et pratiques des chefs de ménages sur le paludisme dans les zones urbaine et rurale de K...

Aedes albopictus et Aedes aegypti sont deux vecteurs potentiels d’arboviroses à Douala. Une bonne connaissance de leurs gîtes larvaires et de leur statut de résistance aux pyréthrinoïdes permettrait une meilleure orientation des opérations de lutte. Les larves et les nymphes ont été récoltées dans divers gîtes temporaires entre juillet et septembre...

Objectif : La mise en œuvre d’une stratégie de lutte efficiente et réussie requiert une évaluation récurrente des rapports qu’entretiennent les populations locales avec la maladie. L’objectif de cette étude était d’évaluer les connaissances, les attitudes et les pratiques (CAP) sur le traitement et la prévention du paludisme. Méthodologie et résult...

Introduction: Schistosomiasis is a neglected tropical disease with endemic foci in Cameroon. Epidemiological data on schistosomiasis in pregnancy are scarce in the country. This study describes the prevalence, diversity and factors associated with schistosomiasis in pregnant women in Njombe-Penja where schistosomiasis was first reported in 1968....

Objectifs : La recherche d’une meilleure stratégie de protection des cultures vivrières contre Eyprepocnemis plorans ibandana Gigli-Tos, 1907 nous a amené à étudier l’abondance et le cycle biologique dans les végétations herbeuses de la zone de forêt humide du sud-Cameroun. Méthodologie et résultats : Les captures et observations ont été menées heb...

Background Schistosomiasis is a Neglected Tropical Disease with endemic foci in Cameroon. Epidemiological data on schistosomiasis in pregnancy are scarce in the country. This study is about schistosomiasis among pregnant women in the Njombe-Penja health district, where schistosomiasis was reported since 1969. Methodology Overall, 282 pregnant wome...

Anopheles hancocki est l’un des vecteurs secondaires du paludisme dont l’écologie larvaire est encore méconnue dans le bloc forestier sud-camerounais. Cette information est pourtant fondamentale pour la mise en place d’une stratégie de contrôle efficace là où ce moustique se fait le vecteur des plasmodiums responsables des paludismes. La présente é...

Mass use of insecticide-treated mosquito nets impregnated with permethrin or its derivatives is likely to result in a decline in vector density and transmission of malaria. The present study shows, on the contrary, higher mosquito aggressiveness and an increase in malaria transmission in a district of Douala where alpha-cypermethrin impregnated mos...

Larval habitats and susceptibility of malaria vectors to insecticides in semi-urban and rural localities of the Coast-Cameroon region : preliminary data. Choosing an appropriate strategy for mosquito control in an eco-climatic facies requires knowledge of vector ecology, including the spatial distribution and productivity of larval habitats and the...

Mosquito vectors are solely responsible for parasitic infections such as malaria, dengue, chikungunya, Japanese encephalitis, and lymphatic filariasis. Anopheles gambiae is the major vector of malaria in sub-Saharan Africa.[1] Silver nanoparticles have the potential to be use as simple, inexpensive, biocompatible, eco-friendly approach for the cont...

Mosquito vectors are solely responsible for parasitic infections such as malaria, dengue, chikungunya, Japanese encephalitis, and lymphatic filariasis. Anopheles gambiae is the major vector of malaria in sub saharan Africa. Silver nanoparticles have the potential to be used as simple, inexpensive, biocompatible, eco-friendly approach for the contro...

Choosing an appropriate strategy for mosquito control in an eco-climatic facies requires knowledge of vector ecology, including the spatial distribution and productivity of larval habitats and their level of susceptibility to insecticides. This study maps, characterizes the mosquito breeding sites and evaluates the susceptibility to insecticides of...

Le paludisme reste un grand problème de santé publique au Cameroun avec 40% à 45% des cas de consultations hospitalières. Sa transmission est assurée par des insectes vecteurs du genre anophèles. Au Cameroun, la lutte antivectorielle est accès sur l’utilisation des moustiquaires imprégnées d’insecticides et les aspersions intradomiciliaires. En 201...

Mosquito vectors are solely responsible for parasitic infections such as malaria, dengue, chikungunya, Japanese encephalitis, and lymphatic filariasis. Anopheles gambiae is the major vector of malaria in sub-Saharan Africa.[1] Silver nanoparticles have the potential to be use as simple, inexpensive, biocompatible, eco-friendly approach for the cont...

A comparative study of the Culicidae biodiversity was carried out on the island of Manoka and Youpwe mainland area, in the Wouri river estuary in Cameroon. This study aimed to identify the mosquito species in the two localities and to compare their abundances for a good planning of the mosquito control on Manoka island. Mosquito surveys were conduc...

L’étude a été menée en mai et juin 2015 dans deux quartiers péri-urbains de la ville de Douala, Yassa (industrialisé) et Logbessou (non industrialisé), afin d’étudier la distribution spatiale des membres du complexe Anopheles gambiae, de déterminer leur statut de résistance et de rechercher la présence et la distribution de la mutation Kdr. Les mou...

The design of an appropriate strategy for mosquito control in urban areas must take into account the local ecoclimate and its particularities. This study sought to determine the dynamics of malaria transmission and the level of insecticide susceptibility of aggressive mosquitoes in Ndogbong, a poorly urbanized district of Douala. Mosquitoes were ca...

Les études récentes au Cameroun ont montré une résistance du vecteur majeur du paludisme Anopheles coluzzii aux insecticides usuels. La recherche des méthodes alternatives de lutte anti-vectorielle devient donc une priorité. La présente étude propose une méthode alternative potentielle de lutte antivectorielle à base d’huiles essentielles extraites...

AbBassterliance te ntomological information should be collected before the implementation of industrial projects in malaria endemic areas. This allows for subsequent monitoring and evaluation of the project impact on malaria vectors. This study aimed at assessing the vectorial system and malaria transmission in two ecologically different villages o...

Une étude visant à caractériser les gîtes larvaires de culicidés a été effectuée dans l’estuaire du Wouri à Douala. Ces gîtes ont été cartographiés, leur productivité ainsi que leurs paramètres physico-chimiques mesurés. Les imagos issus des larves collectées ont été identifiés morphologiquement et ceux appartenant au complexe Anopheles gambiae par...

Objectifs : La recherche d’une stratégie de protection des cultures vivrières contre le criquet ravageur Zonocerus variegatus (Linnaeus 1758) (Orthoptera : Pyrgomorphidae) a consisté à étudier chez cet hôte, la prévalence et l’abondance de Charletonia cameroonensis Haitlinger & Kekeunou, 2014 (Acari : Erythraeidae) dans la zone côtière du Cameroun....

Background: The effectiveness of Long-Lasting Insecticidal Nets and Indoor Residual Spraying in malaria vector control is threatened by vector resistance to insecticides. Knowledge of mosquito habitats and patterns of insecticide resistance would facilitate the development of appropriate vector control strategies. Therefore, we investigated An. co...

In recent decades, the fight against filariasis is hampered by increasing vector resistance to conventional insecticides that accumulate in the environment. This study proposes an approach for fighting against pre-imaginal stages of Culex pipiens based on essential oils from pericarps of some citrus fruits. Essential oils were obtained by steam dis...

A study of the malaria transmission was carried out for the first time in the Manoka Island and Youpwè mainland area in Douala. Mosquitoes were sampled by human landing catches simultaneously indoor and outdoor in December 2013 and April 2014. Collected mosquitoes were morphologically identified and anopheles ovaries were dissected for parity deter...

This study determines the influence of urbanization on vector susceptibility to essential oils of some plants from Cameroon. Essential oils were produced from pericarp of ripe fruits Citrus and fresh leaves of Cymbopogon citratus, using a Clevenger-type apparatus. Analysis was made by gas chromatography or gas chromatography coupled with mass spect...

An entomological survey was carried out from August to November 2013, in order to determine the vector system of a building site for social housing in a coastal periurban district of Douala (Cameroon). Mosquito larvae were collected and adult endophilic mosquitoes captured on volunteers, for a total sample of 4897 mosquitoes. Morpho-taxonomic techn...

Abstract Background The use of inland valley swamps for vegetable crop agriculture contributes to food security in urban and less urbanized settings in Africa. The impact of this agriculture on aggressive mosquitoes’ diversity and malaria transmission in central Africa is poorly documented. This study is aimed at assessing the impact of vegetable c...

This study was conducted from January to December 2010 to evaluate the anopheline diversity and transmission of malaria in Ayos, a degraded forest area in the south of Cameroon, targeted for the distribution of long-lasting insecticidal nets (LLINs). Mosquito larvae were collected by the dipping method and endophilic female adult mosquitoes were ca...

The biological activities of essential oils from three plants grown in Cameroon: Ocimum basilicum, Ocimum canum, and Cymbopogon citratus were tested against Plasmodium falciparum and mature-stage larvae of Anopheles funestus. Gas chromatography and gas chromatography - mass spectrometry analyses showed that the main compounds are geranial, 1,8-cine...

Cette étude sur la diversité et les variations saisonnières des Culicidae a été menée pendant 12 mois (de janvier à décembre 2004) à Yaoundé, grâce à des récoltes bimensuelles de larves dans la rivière Mefou et dans le lac de Nkolbisson. Durant l'étude, 6725 larves de Culicidae ont été récoltées; après élevage 5541 adultes ont été obtenus. Les étud...

Afin d'évaluer l'impact des aménagements piscicoles sur la productivité culicidienne en zone urbaine, une enquête entomologique longitudinale a été menée de Janvier à Décembre 2004 dans un quartier de la ville de Yaoundé; capitale de Cameroun où il a été aménagé une station aquacole. Les larves de culicidés ont été récoltées bimensuellement par la...