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Korean J Parasitol > Volume 32(3):1994 > Article

Original Article
Korean J Parasitol. 1994 Sep;32(3):157-161. English.
Published online Sep 20, 1994.  http://dx.doi.org/10.3347/kjp.1994.32.3.157
Copyright © 1994 by The Korean Society for Parasitology
The first discovery of an endemic focus of Heterophyes nocens (Heterophyidae) infection in Korea
J Y Chai,*H K Nam,J Kook and S H Lee
Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
Received July 05, 1994; Accepted July 20, 1994.

Abstract

A highly endemic focus of human infection with Heterophyes nocens (Heterophyidae) was discovered from a small coastal village of Shinan-gun, Chollanam-do, for the first time in Korea. Fecal examinations by cellophane thick smear and formalin-ether sedimentation techniques revealed 42.9% heterophyid egg positive rate out of 98 inhabitants examined. It was difficult to confirm the species of heterophyids only by eggs. In order to collect the adult flukes, the egg positive cases were treated with 10 mg/kg single dose of praziquantel and purged with magnesium sulfate, and the adult worms were collected from the diarrheic stools. From each of 18 cooperative patients 1 to 1,124 (total 4,730) H. nocens worms were recovered, together with a few to large numbers of heterophyids (Pygidiopsis summa, Stictodora fuscatum) and/or gymnophallids (Gymnophalloides seoi). It is speculated that H. nocens might be widely distributed along the southwestern coastal areas where the brackish water fish such as the mullets or gobies are popularly eaten raw.

Figures


Figs. 1-4
Fig. 1.Heterophyes nocens adult flukes recovered from a patient (code No. 15 of Table 1). Formalin-fixed unstained specimens. Scale bar: 0.5 mm. Fig. 2. An adult specimen of H. nocens recovered from the same patient showing the oral sucker, ventral sucker (VS), genital sucker (GS) and testes (T). Ventral view, fresh preparation. Scale bar: 0.1mm. Fig. 3. Close-up view of the genital sucker (GS), which is armed with 52 chitinous rodlets on its gonotyl. Scale bar: 0.1 mm. Fig. 4. An egg of H. nocens found in the feces of a patient, showing its ovoid shape with maximum width near the equatorial portion, small operculum, clean shell surface, and containing a miracidium. Scale bar: 0.02mm.

Tables


Table 1
Number of H. nocens recovered from each infected case

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