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. 2014 Dec 12;7:536. doi: 10.1186/s13071-014-0536-0

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© Pedersen et al.; licensee BioMed Central. 2014

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Snail sample sites and occurrence of three snail species: red circle Bulinus globosus , semi-circle Biomphalaria pfeifferi , open square Lymnaea natalensis , and open circle absences.