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1. Longitudinal survey on the distribution of Biomphalaria sudanica and B. choanomophala in Mwanza region, on the shores of Lake Victoria, Tanzania: implications for schistosomiasis transmission and control

Author

Anouk N. Gouvras, Fiona Allan, Safari Kinung’hi, Muriel Rabone, Aidan Emery, Teckla Angelo, Tom Pennance, Bonnie Webster, Honest Nagai, and David Rollinson

Subjects
Population Density, Biomphalaria, Research, Rain, Water, Schistosoma mansoni, Seasonality, Lake Victoria, Tanzania, Schistosomiasis mansoni, lcsh:Infectious and parasitic diseases, Mwanza, Lakes, Snail, Intestinal schistosomiasis, B. sudanica, Transmission, Animals, Humans, lcsh:RC109-216, B. choanomphala, Longitudinal Studies, Seasons, Ecosystem, Disease Reservoirs
Abstract

Background Schistosomiasis is hyper-endemic in the Lake Victoria basin; with intestinal schistosomiasis plaguing communities adjacent to the lake, where the intermediate host snails live. The two intermediate host species of Schistosoma mansoni in the Mwanza region are Biomphalaria sudanica, found on the banks of the lakes, and B. choanomphala, found in the lake itself. There are few longitudinal surveys documenting changing abundance and differential transmission patterns of these Biomphalaria snails across seasons and years. We undertook 15 field surveys at 26 sites over four years to determine the parameters that influence Biomphalaria abundance, presence of S. mansoni-shedding snails and impact of schistosomiasis treatment interventions on transmission potential in the Mwanza region. Results Statistical analysis revealed seasonal difference in the abundance of B. sudanica with the highest number of snails found in the dry season (Kruskal-Wallis χ 2 = 37.231, df = 3, P

Published
2017

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