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Intensity of infection of immature trematode stages in Bithynia siamensis goniomphalos during different seasons. The mean intensity ± standard deviation (SD; log transformed) for Opisthorchis viverrini sensu lato (s.l.) (A–C) and for virgulate (D–F) are shown. *P < 0.05, **P < 0.01, ***P < 0.001 by Mann–Whitney U test. (A) Tissue rediae; (D) tissue sporocyst; (B, E) tissue cercariae; and (C, F) cercarial release per day. SD = standard deviation.
