DPDx is an education resource designed for health professionals and laboratory scientists. For an overview including prevention and control visit www.cdc.gov/parasites/.
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Adults of Heterophyes heterophyes are minute flukes, measuring 1-2 mm in length. The tests are large and paired, and are situated near a small ovary. The surface of the worm is covered with minute spines. Adults reside in the small intestine of the definitive host.
Like all trematodes, Heterophyes heterophyes requires a snail as an intermediate host. Cerithideopsilla cingulata is the main first intermediate host for H. heterophyes in southeast Asia.