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Photomicrographs of samples collected from fish and people living in the village where O. viverrini is endemic used in this study. (a) Egg of O. viverrini (arrow) and an egg of Ascaris lumbricoides (X) (magnification, ×400); (b and c) metacercarial cyst and a metacercaria from fish (magnification, ×100); (d) unstained adult O. viverrini worm from a patient (magnification, ×40).
