NCIt definition : A species of parasitic flatworms in the family Heterophyidae. The lifecycle of H.
heterophyes involves snails as the first intermediate host, freshwater fish as the
second intermediate host, and humans, fish-eating carnivores, or birds as the definitive
host. Infestation causes heterophyiasis.;
Alternative definition : CDISC: Any trematode parasite that can be assigned to the species Heterophyes heterophyes.;