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Correlation between Opisthorchis viverrini sensu lato (s.l.) rediae (A) and cercariae (B) with shell length of Bithynia siamensis goniomphalos (N = 119). For rediae (A) the solid line represents the line of best fit (r = 0.304, P < 0.000) and for cercariae (B) (r = 0.172, P = 0.006).
