Cutaneous larva migrans induced by swallowing live pond loaches

Freshwater fish, specifically loaches, are potential hosts of Gnathostoma species. Consumption of uncooked freshwater loaches may result in cutaneous larva migrans. We report the case of a 70-year-old Taiwanese man who presented with a serpiginous skin rash on his abdomen. He had eaten live loaches intermittently (sometimes daily) for 5 months before his presentation. On histopathological examination, a transected parasite body and a headbulb were found in the mid-dermis. The parasite was confirmed as belonging to the genus Gnathostoma, most likely Gnathostoma doloresi. The patient recovered uneventfully without treatment, and had no symptoms at his 12-month follow-up visit.