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. 2017 Apr 4;6:66. doi: 10.1186/s40249-017-0281-7

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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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Fig. 1 — Geographical locations of the study sites. a Stool samples were collected and examined for the presence of O. viverrini eggs from participants in 12 villages (as indicated by the red dots) in Maha Sarakham Province, north-eastern Thailand. b This shows the spatial arrangement of households in villages 3 and 4. Households with members who are infected with O. viverrini are indicated by a red dot, while households free of infection are indicated by a blue dot. The satellite image was retrieved from Google Earth