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. 2014 Oct 21;11:183. doi: 10.1186/1743-422X-11-183

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© Nitatpattana et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. 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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Study sites. Legend: Left: Kingdom of Thailand (green); Khon Kaen Province (brawn); Wang Hin Lat sub district (yellow). Right: Wang Hin Lat sub district (yellow); The two study villages (=Thai: ban) of Pong Haeng (16°36′45″N, 102°3′35″E) and Nong Thum (16°36′47″N, 102°4′50″E) distant for less than 1.5 to 2 km one from the other.