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Comparisons of shell length of Bithynia siamensis goniomphalos with different infection statuses and seasons. Data shown are mean ± SD of shell length for uninfected (white), Opisthorchis viverrini sensu lato (s.l.) infected (gray) and virgulate cercariae infected (black). *P < 0.05, **P < 0.01, ***P < 0.001 by Mann–Whitney U test. SD = standard deviation.
