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Environmental epidemiology of intestinal schistosomiasis in Uganda: population dynamics of biomphalaria (gastropoda: planorbidae) in Lake Albert and Lake Victoria with observations on natural infections with digenetic trematodes.

Rowel, C, Fred, B, Betson, M, Sousa-Figueiredo, JC, Kabatereine, NB and Stothard, JR (2015) Environmental epidemiology of intestinal schistosomiasis in Uganda: population dynamics of biomphalaria (gastropoda: planorbidae) in Lake Albert and Lake Victoria with observations on natural infections with digenetic trematodes. Biomed Res Int, 2015.

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Abstract

This study documented the population dynamics of Biomphalaria and associated natural infections with digenetic trematodes, along the shores of Lake Albert and Lake Victoria, recording local physicochemical factors. Over a two-and-a-half-year study period with monthly sampling, physicochemical factors were measured at 12 survey sites and all freshwater snails were collected. Retained Biomphalaria were subsequently monitored in laboratory aquaria for shedding trematode cercariae, which were classified as either human infective (Schistosoma mansoni) or nonhuman infective. The population dynamics of Biomphalaria differed by location and by lake and had positive relationship with pH (P < 0.001) in both lakes and negative relationship with conductivity (P = 0.04) in Lake Albert. Of the Biomphalaria collected in Lake Albert (N = 6,183), 8.9% were infected with digenetic trematodes of which 15.8% were shedding S. mansoni cercariae and 84.2% with nonhuman infective cercariae. In Lake Victoria, 2.1% of collected Biomphalaria (N = 13,172) were infected with digenetic trematodes with 13.9% shedding S. mansoni cercariae, 85.7% shedding nonhuman infective cercariae, and 0.4% of infected snails shedding both types of cercariae. Upon morphological identification, species of Biomphalaria infected included B. sudanica, B. pfeifferi, and B. stanleyi in Lake Albert and B. sudanica, B. pfeifferi, and B. choanomphala in Lake Victoria. The study found the physicochemical factors that influenced Biomphalaria population and infections. The number and extent of snails shedding S. mansoni cercariae illustrate the high risk of transmission within these lake settings. For better control of this disease, greater effort should be placed on reducing environmental contamination by improvement of local water sanitation and hygiene.

Item Type: Article
Divisions : Faculty of Health and Medical Sciences
Authors :
AuthorsEmailORCID
Rowel, CUNSPECIFIEDUNSPECIFIED
Fred, BUNSPECIFIEDUNSPECIFIED
Betson, MUNSPECIFIEDUNSPECIFIED
Sousa-Figueiredo, JCUNSPECIFIEDUNSPECIFIED
Kabatereine, NBUNSPECIFIEDUNSPECIFIED
Stothard, JRUNSPECIFIEDUNSPECIFIED
Date : 2015
Identification Number : 10.1155/2015/717261
Related URLs :
Additional Information : Copyright © 2015 Candia Rowel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Depositing User : Symplectic Elements
Date Deposited : 11 Aug 2015 14:16
Last Modified : 11 Aug 2015 14:16
URI: http://epubs.surrey.ac.uk/id/eprint/808136

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