Évaluation de la composition spécifique des glossines, vectrices de la Trypanosomose Humaine Africaine, dans la région de Ndendé au sud du Gabon

Koumba, Christophe Roland Zinga; Mounioko, Franck; Koumba, Aubin Armel; Zahouli, Julien Z. B.; Maroundou, Audrey Pamela; Acapovi-Yao, Geneviève Lydie; M’Batchi, Bertrand; Mavoungou, Jacques François

doi:10.4314/jab.v123i1.5

Cited by 3 publications

(3 citation statements)

References 11 publications

(16 reference statements)

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“…The striking fact in our study is the total absence of tsetse flies (Glossina spp) in our inventory despite the use in the field of Vavoua traps which are more suitable for their capture (Koumba et al, 2018). This absence of tsetse flies in our sampling may be linked to the existence in the field of several works aimed at eradicating the tsetse fly (Mouchet et al, 1961) and programs for the control of clean vectors or biological vectors of trypanosomes in Cameroon sometimes including the Central African sub-region.…”

Section: Inventory Of Haematophagous Insects Potential Vectors Of Aatmentioning

confidence: 75%

Entomological inventory of bovine trypanosome vectors in the locality of Logone Birni, Far North Cameroon

TOMPALOUMLA,

ZIEBE,

AZO’O

et al. 2023

Int. J. Livest. Prod.

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In order to identify the vectors of bovine trypanosomiasis in the locality of Logone Birni, inventories were carried out from March to June 2020 in six sites. The purpose of this work is to contribute to the evaluation of the seroprevalence of bovine trypanosomiasis, to identify trypanosome vectors and to inventory the vector control methods already implemented in this area. Forty cattle were sampled for parasite analysis using the Rapid Diagnostic Test (RDT) method. Insect captures were made using Vavoua traps at a frequency of three successive days per week during the two months of investigations. Surveys and interviews were also conducted with thirty people (traditional leaders, livestock farmers and shepherds) about local control methods. The analysis results show that, of the 40 cattle tested, Trypanosoma vivax and Trypanosoma congolense are the most frequent parasites with a seroprevalence rate of 30 and 05%, respectively. A total of 12,482 Stomoxes and 494 Tabanids were captured with an average of Apparent Population Density (APD) of 173.36 Stomoxes/Trap/Day and 6.86 Tabanids/Trap/Day, respectively. In short, trypanosome seroprevalence is very high compared to the diversity of mechanical vectors (Stomoxes and Tabanids) and the absence of biological vectors (Glossina species). According to breeders, control methods reduce the pressure of insect vectors on cattle and make pastures more accessible, hence the need to deepen by diversifying control methods against the mechanical vectors listed.

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Section: Inventory Of Haematophagous Insects Potential Vectors Of Aatmentioning

confidence: 75%

Entomological inventory of bovine trypanosome vectors in the locality of Logone Birni, Far North Cameroon

TOMPALOUMLA,

ZIEBE,

AZO’O

et al. 2023

Int. J. Livest. Prod.

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“…In Gabon, inventories on the species composition, abundance and diversity of vectors of HAT in protected areas and its environs have been documented [6,7,8,9,10]. Little information exists on infection rates of glossines with human and bovine trypanosomes in Gabon [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

High Frequency and Activity of Glossina spp., Vectors of Human African Trypanosomiasis along a Secondary Forest-Man Made Transect in Makokou (North East-Gabon)

Roland¹,

Lendzele²,

Joseph-Marie

et al. 2019

AJOB

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The abundance, species diversity and diurnal activity rhythm of hematophagous glossineswere evaluated by trapping using 15 Vavoua traps, during the rainy season (25th Sept-5th Oct to 21st Oct-9th Nov 2018), in two habitats: secondary forest and Anthropised milieu, in the biosphere reserve Ipassa-IRET Makokou in Gabon. In total, 489 glossines were caught with 245 collected from Village-Town site and regrouped under 4 species [G.p.palpalis (32.17%), G. frezili (36.23%), G. nashi (29.57%) and G. f. fuscipes (2.03%)] while 244 were collected from forest and regrouped under 3 species [G.p.palpalis (61.48%), G. nashi (28.69%) and G. frezili (0.84%)]. The abundance of glossines was higher in the Village-Town milieu (2.88 g/t/d) as compared to the forest (2.34 g/t/d) with no statistically significant difference (P>0.05). Glossines showed a unimodal diurnal activity rhythm with peak between 10h-12h in the two milieu and was dominated by females.

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“…These diseases caused by Trypanosomatidae belong to the group of neglected tropical diseases (NTDs), occurring in developing areas 2 . Sub-Saharan African countries suffer from a significant impact of NTDs on public health and economic development 3 . Glossina palpalis gambiensis (Vanderplank, 1949) is one of the main vectors of the HAT parasite in West Africa and is responsible for the persistence of many residual outbreaks of this disease in forest and savannah areas 4 .…”

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confidence: 99%

Boosting the sterile insect technique with pyriproxyfen increases tsetse flies Glossina palpalis gambiensis sterilization in controlled conditions

Laroche

Ravel²,

Baldet

et al. 2020

Sci Rep

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Tsetse flies (Diptera: Glossinidae) are the main vectors of animal and human trypanosomoses in Africa. The Sterile Insect Technique (SIT) has proven effective in controlling tsetse flies when applied to isolated populations but necessitates the production of large numbers of sterile males. A new approach, called boosted SIT, combining SIT with the contamination of wild females by sterile males coated with biocides has been proposed for large-scale control of vector populations. The aim of the study was to evaluate this new approach using pyriproxyfen on the riverine species Glossina palpalis gambiensis (Vanderplank, 1949) in the laboratory. The contamination dose and persistence of pyriproxyfen on sterile males, the impact of pyriproxyfen on male survival, and the dynamics of pyriproxyfen transfer from a sterile male to a female during mating, as well as the impact of pyriproxyfen on pupal production and adult emergence, were evaluated in the laboratory. For this purpose, a method of treatment by impregnating sterile males with a powder containing 40% pyriproxyfen has been developed. The results showed that the pyriproxyfen has no impact on the survival of sterile males. pyriproxyfen persisted on sterile males for up to 10 days at a dose of 100 ng per fly. In addition, the horizontal transfer of pyriproxyfen from a treated sterile male to a female during mating could be measured with an average of 50 ng of pyriproxyfen transferred. After contacts without mating, the average quantity transferred was more than 10 ng. Finally, the pyriproxyfen powder was very effective on G. p. gambiensis leading to 0% emergence of the pupae produced by contaminated females. These promising results must be confirmed in the field. A large-scale assessment of this boosted pyriproxyfen-based SIT approach will be carried out against tsetse flies in Senegal (West Africa).

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Évaluation de la composition spécifique des glossines, vectrices de la Trypanosomose Humaine Africaine, dans la région de Ndendé au sud du Gabon

Cited by 3 publications

References 11 publications

Entomological inventory of bovine trypanosome vectors in the locality of Logone Birni, Far North Cameroon

Entomological inventory of bovine trypanosome vectors in the locality of Logone Birni, Far North Cameroon

High Frequency and Activity of Glossina spp., Vectors of Human African Trypanosomiasis along a Secondary Forest-Man Made Transect in Makokou (North East-Gabon)

Boosting the sterile insect technique with pyriproxyfen increases tsetse flies Glossina palpalis gambiensis sterilization in controlled conditions

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