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Map of study area in the Bangkok Metropolitan Region, Thailand. Sky blue spot, yellow spot, and red spot represent: (1) sampling locality without distribution of Bithynia siamensis siamensis snails, (2) sampling locality with B. s. siamensis distribution but no detected Opisthorchis viverrini s.l., and (3) locality with B. s. siamensis distribution and detected O. viverrini s.l., respectively.
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