9 results on '"Djuikwo-Teukeng, F. F."'
Search Results
2. Comparison of two diagnostic techniques to determine the prevalence of Schistosoma mansoni infections in Cameroonian school children.
- Author
-
Sangue Soppa, N. P., Mekam Nkengni, S. M., Nguepnang, R. P., Vignoles, P., Tchuem-Tchuenté, L. A., and Djuikwo Teukeng, F. F.
- Subjects
SCHISTOSOMA mansoni ,SCHOOL children ,FECES ,DISEASE prevalence ,INFECTION - Abstract
Background: The Kato-Katz technique is recommended for diagnosis of Schistosoma mansoni infection by the World Health Organization. However, egg counts are subject to variability. The aim of this study is to determine the prevalence of S. mansoni infection in school children using two different techniques and to recommend the technique that should be routinely used in the diagnosis of this infection. Methodology: Field investigations on faecal samples from 299 Cameroonian school children were carried out in 2016 to compare the effectiveness of the Kato-Katz and Formalin-ether techniques in diagnosis of S. mansoni infections. Results: Schistosome eggs were detected in 37 (12.3%) samples with the Kato-Katz technique and 61 (20.4%) samples with the Formalin-ether technique. The difference between the prevalence observed for the two techniques was significant in males and age group 10 - 12 years (p < 0.5). Conclusion: The Formalin-ether technique was more sensitive than the Kato-Katz method for detecting S. mansoni eggs in faecal matter. Despite its cost, the Formalin-ether technique can be routinely used in the laboratory for epidemiological studies of intestinal schistosomiasis. Contexte: La méthode Kato-Katz est recommandée par l'Organisation mondiale de la santé pour le diagnostic de l'infection à Schistosoma mansoni. Cependant, le nombre d'oeufs est sujet à une variabilité. Le but de cette étude est de déterminer la prévalence de l'infection à S. mansoni chez les écoliers en utilisant deux techniques différentes et de recommander la technique à utiliser systématiquement pour le diagnostic de cette infection. Méthodologie: Des enquêtes sur le terrain sur des échantillons de selles provenant de 299 écoliers camerounais ont été menées en 2016 pour comparer l'efficacité des techniques de Kato- Katz et au formol-éther dans le diagnostic des infections à S. mansoni. Résultats: Des oeufs de schistosomes ont été détectés dans 37 échantillons (12,3%) avec la technique de Kato-Katz et 61 échantillons (20,4%) avec la technique au formol-éther. La différence entre la prévalence observée pour les deux techniques était significative chez les hommes et chez les 10-12 ans (p <0,5). Conclusion: La technique au formol-éther était plus sensible que la méthode de Kato-Katz pour détecter les oeufs de S. mansoni dans les matières fécales. En dépit de son coût, la technique formol-éther peut être utilisée systématiquement en laboratoire pour des études épidémiologiques sur la schistosomiase intestinale. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
3. Seroprevalence of Toxoplasmosis and associated risk factors in pregnant women at the Protestant Hospital, Mbouo-Bandjoun, Cameroon.
- Author
-
Guemgne Todjom, F., Makou Tsapi, E., Gamago, G. A., Vignoles, P., Wabo Pone, J., and Djuikwo Teukeng, F. F.
- Subjects
SEROPREVALENCE ,PREGNANT women ,WOMEN'S hospitals ,TOXOPLASMOSIS ,DISEASE risk factors ,LOGISTIC regression analysis - Abstract
Copyright of African Journal of Clinical & Experimental Microbiology is the property of African Journals Online (AJOL) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
4. Prevalence and intensity of urinary schistosomiasis among school children in the district of Niakhar, region of Fatick, Senegal
- Author
-
Senghor, B., Diallo, A., Sylla, S. N., Doucouré, Souleymane, Ndiath, M. O., Gaayeb, L., Djuikwo-Teukeng, F. F., Ba, C. T., and Sokhna, Cheikh
- Subjects
Intensity ,Epidemiology ,Helminths ,Niakhar ,Prevalence ,Urinary schistosomiasis ,Infection ,Senegal - Abstract
Background: Urinary schistosomiasis is a parasitic disease that exists in all regions of Senegal. It is a major public health issue in this country. This study was carried out to determine the prevalence and intensity of this parasitosis in 12 villages of Niakhar (Fatick, Senegal). Methods: A total of 210 schoolchildren, aged 7 to 15 years, were enrolled in this study, and urine samples were examined for Schistosoma haematobium eggs using a standard urine filtration technique. Results: Of these children, 121 (57.6%) were found to be infected with a mean geometric count of 185 eggs per 10 ml of urine. The disease was present in all surveyed villages, and the prevalence ranged from 14.3% to 92.8%. The prevalence of infection was significantly correlated with increasing age and was higher in boys. Infection intensity was significantly higher in boys but did not significantly differ with age. Significant relationships between i) water contact or access to running water and ii) the prevalence or intensity of urinary schistosomiasis were also noted. Conclusions: The district of Niakhar is endemic for urinary schistosomiasis, with a high intensity of infection. A control program to decrease the prevalence and intensity should be implemented in this area to improve community health.
- Published
- 2014
5. Significant population genetic structure of the Cameroonian fresh water snail, Bulinus globosus, (Gastropoda: Planorbidae) revealed by nuclear microsatellite loci analysis.
- Author
-
Djuikwo-Teukeng, F. F., Da Silva, A., Njiokou, F., Kamgang, B., Same Ekobo, A., and Dreyfuss, G.
- Subjects
- *
POPULATION genetics , *SNAILS , *BULINUS globosus , *GASTROPODA , *PLANORBIDAE , *MICROSATELLITE repeats - Abstract
In order to characterize the demographic traits and spatial structure of Cameroonians Bulinus globosus, intermediate host of Schistosoma haematobium, genetic structure of seven different populations, collected from the tropical zone, was studied using six polymorphic microsatellites. Intrapopulation genetic diversity ranged from 0.37 to 0.55. Interpopulation genetic diversity variation clearly illustrated their significant isolation due to distance with gene flow substantially limited to neighbouring populations. The effective population sizes (Ne) were relatively low (from 3.0 to 18.6), which supposes a high rate from which populations would lose their genetic diversity by drift. Analysis of genetic temporal variability indicated fluctuations of allelic frequencies (35 of 42 locus-population combinations, P<0.05) characteristic of stochastic demography, and this is reinforced by events of bottlenecks detected in all populations. These findings demonstrated that Cameroonian B. globosus were mixed-maters with some populations showing clear preference for outcrossing. These data also suggest that genetic drift and gene flow are the main factors shaping the genetic structure of studied populations. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
6. RADIX NATALENSIS (GASTROPODA: LYMNAEIDAE), A POTENTIAL INTERMEDIATE HOST OF FASCIOLA HEPATICA IN EGYPT.
- Author
-
DAR, Y., DJUIKWO TEUKENG, F. F., VIGNOLES, P., DREYFUSS, G., and RONDELAUD, D.
- Abstract
The article examines the potential of Egyptian Radix natalensis to act as an intermediate host in the lifecycle of Fasciola Hepatica. The researchers experimentally exposed R. natalensis to miracidia using lymnaeids and observed live larval forms of F. hepatica both in the single- and double-exposed snails. Findings also revealed a significant increase in snail survival after 28 days of exposure as well as a decrease in the prevalence of infection when the shell height of snails at exposure increases. The snails shed cercariae of F. hepatica during a mean patent period of 24.3 days and released all these cercariae during two-13 waves of shedding.
- Published
- 2010
- Full Text
- View/download PDF
7. Differences in the compatibility of infection between the liver flukes Fascioloides magna and Fasciola hepatica in a Colombian population of the snail Galba sp.
- Author
-
Dreyfuss G, Correa AC, Djuikwo-Teukeng FF, Novobilský A, Höglund J, Pankrác J, Kašný M, Vignoles P, Hurtrez-Boussès S, Pointier JP, and Rondelaud D
- Subjects
- Animals, Czech Republic, Fasciola hepatica growth & development, Fascioliasis parasitology, Fasciolidae growth & development, Female, France, Male, Snails classification, Snails growth & development, Disease Reservoirs parasitology, Fasciola hepatica physiology, Fascioliasis veterinary, Fasciolidae physiology, Snails parasitology
- Abstract
Experimental infections of Galba sp. (origin, Colombia) with allopatric isolates of Fasciola hepatica from France or Fascioloides magna from the Czech Republic were carried out during five successive snail generations to determine if this lymnaeid might sustain complete larval development of either parasite. In snails exposed to F. hepatica, 7 of 400 snails harboured several rediae and only two snails contained a small number of free cercariae on day 50 post-exposure. In contrast, the intensity of F. magna infection in Galba sp. progressively increased from the F1 to F5 generations. Spontaneous cercarial shedding of F. magna occurred in 7 of 100 Galba sp. belonging to the F5 generation and the number of shed cercariae did not differ significantly from that noted in control Galba truncatula of French origin. Galba sp. from Colombia can be added to the list of potential intermediate hosts for F. magna.
- Published
- 2015
- Full Text
- View/download PDF
8. Lymnaea neotropica and Lymnaea viatrix, potential intermediate hosts for Fascioloides magna.
- Author
-
Sanabria R, Mouzet R, Pankrác J, Djuikwo Teukeng FF, Courtioux B, Novobilský A, Höglund J, Kašný M, Vignoles P, Dreyfuss G, Rondelaud D, and Romero J
- Subjects
- Animals, Argentina, DNA, Intergenic chemistry, DNA, Intergenic genetics, Larva growth & development, Lymnaea classification, Lymnaea genetics, Molecular Sequence Data, Sequence Analysis, DNA, Uruguay, Fasciolidae growth & development, Fasciolidae isolation & purification, Lymnaea parasitology
- Abstract
Experimental infections of two South American lymnaeid populations with Fascioloides magna were carried out to determine whether these snails may sustain larval development of this digenean and, if so, to quantify their potential for cercarial production. The reference group was a French population of Galba truncatula infected and raised according to the same protocol. According to the internal transcribed sequence (ITS)-1 segment of their genomic rDNA, these South American populations were identified as Lymnaea neotropica (origin, Argentina) and Lymnaea viatrix var. ventricosa (origin, Uruguay). In the snail groups followed for cercarial shedding, longer prepatent periods and lower numbers of shed cercariae were noted in South American lymnaeids. In other snails dissected at day 65 post-exposure, the redial and cercarial burdens of F. magna found in the bodies of L. neotropica and L. v. ventricosa were significantly lower than those noted in G. truncatula. Compared to the total cercarial production noted in the dissected snails, the percentage of cercariae that exited from snails was 51.3% for G. truncatula, 32.2% for L. neotropica and 46.8% for L. v. ventricosa. The two South American species of snails can thus be considered as potential intermediate hosts of F. magna.
- Published
- 2013
- Full Text
- View/download PDF
9. Strong genetic structure in Cameroonian populations of Bulinus truncatus (Gastropoda: Planorbidae), intermediate host of Schistosoma haematobium.
- Author
-
Djuikwo-Teukeng FF, Njiokou F, Nkengazong L, De Meeûs T, Ekobo AS, and Dreyfuss G
- Subjects
- Animals, Cameroon, Gastropoda parasitology, Polymorphism, Genetic, Gastropoda genetics, Host-Parasite Interactions, Schistosoma haematobium physiology
- Abstract
In order to evaluate the snail host contribution on the variability of mollusk/schistosome compatibility, the genetic structure of seven Cameroonian populations of the schistosome vector, Bulinus truncatus, was studied using four variable microsatellite loci. A substantial polymorphism mainly distributed among populations was observed. No heterozygous genotype was scored, confirming the high level of selfing rate occurring in B. truncatus populations. Contemporaneous samples were highly and significantly differentiated with a marginally significant correlation with geographical distances (P-value=0.069). The different sites sampled seemed to rarely exchange migrants with very small Nm (∼0.22 or below). The data also suggest that B. truncatus subpopulations might be composed of very small and isolated units at much smaller surfaces than what was investigated. Even if more data (in particular more loci) will be needed to confirm these issues, they suggest that restricted gene flow plays an important role in maintaining differentiation among snail populations in the transmission foci, potentially leading to specific adaptation between each B. truncatus population and its local Schistosoma haematobium population., (Copyright © 2010 Elsevier B.V. All rights reserved.)
- Published
- 2011
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.