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Parasit Host Dis > Volume 26(3):1988 > Article

Original Article
Korean J Parasitol. 1988 Sep;26(3):199-206. Korean.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1988.26.3.199
Copyright © 1988 by The Korean Society for Parasitology
An epidemiological suryey of Echinostoma hortense infection in Chongsong-gun, Kyongbuk province
Sang Kum Lee,Nak Seung Chung,Ill Hyang Ko,Woon Mok Sohn,*Sung Tae Hong,Jong Yil Chai and Soon Hyung Lee
*Department of Cinical Pathology, Seoul Paik Hospital, Seoul 110-032, and Department of Parasitolgy, InJe Medical College, Busan 614-112, Korea.
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Seoul l10-460, Korea.

An epidemiological study was performed to know the infection status of E. hortense among the human residents and fish intermediate hosts in Chongsong-gun, Kyongsangbuk-do. Out of 263 people examined, 59(22.4 per cent) were positive for the eggs of E. hortense. Total 152 fresh water tishes (9 species) were examined, and Odontobutis obscura interrupta, Misgurnus angullicaudatus and Squalidus coreanus were found to harbour the metacercariae of E. hortense. Juvenile or adult E. hortense were expelled from 35 out of 54 cases treated with praziquantel. The number of worms per individual ranged from l to 649, with the average burden of 51. The eosinophil count of infected persons ranged 1-24 per cent (6 per cent in average). The number of eggs per day per worm (EPDPW) in human host was estimated about 1,478. The results showed that Chongsong-gun is an endemic area of E. hortense.


Fig. 1
Surveyed areas(•) in Chongsong-gun.

Figs. 2-3
Fig. 2.Squalidus coreanus, a new second intermediate host of E. hortense.

Fig. 3. A metacercaria of E. hortense encysted in the muscle of S. coreanus, showing oral sucker(OS), ventral sucker(VS) and collar spines (arrow heads).

Figs. 4-5
Fig. 4. A total of 649 E. hortense, collected from a most heavily infected case.

Fig. 5.E. hortense, showing internal organs. Acetocarmine stained.


Table 1
Results of stool examination among the inhabitants of subjected areas

Table 2
Number of E. hortense egg positive cases by surveyed stream and village

Table 3
Egg positive rates of E. hortense by age and sex of inhabitants

Table 4
Detection rate of E. hortense metacercariae in the fresh water fishes caught from Yongjeon-cheon and Nool-cheon(stream)

Table 5
Result of worm collection after praziquantel treatment*

Table 6
Distribution of number of case by the number of worms collected

Table 7
Relations between EPG grade and number of worms collected

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