Heterophyes heterophyes is a minute trematode flatworm parasite. Although primarily an enteric (i.e., intestinal) parasite, ectopic (i.e., abnormally located) infections can occur and most commonly involve the brain, spinal cord, and heart. In addition to humans, various fish-eating mammals (e.g., cats and dogs) and birds can be infected by H. heterophyes.
(Eisheikha 2007; Centers for Disease Control Parasites and Health website)
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