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Studies on intestinal trematodes in Korea XX. Four cases of natural human infection by Echinochasmus japonicus
Byong Seol Seo,Soon Hyung Lee,Jong Yil Chai and Sung Jong Hong
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Seoul 110, Korea.
Abstract
Four cases of human infection by Echinochasmus japonicus (Trematoda; Echinostomatidae) were proven by the recovery of adult worms after a treatment with praziquantel (10 mg/kg in single dose) and purgation in February 1984 in Korea. The patients were 3 middle-aged men and 1 elderly woman residing in a riverside village of Kangjin-gun ( Tamjin river), Jeonranam-do, an ever-known endemic area of metagonimiasis. The treatment revealed numerous M. yokogawai worms together with 1-43 (total 54 ) specimens of E. japonicus and/or a few number of other kinds of trematodes or cestodes. The patients had gastrointestinal troubles such as indigestion and abdominal discomfort, probably due to these fluke infections. They have been eating some raw flesh of fresh water fishes such as cyprinoid ones or sweetfish caught from the river. This is the first record of human E. japonicus infection in the literature.
Figures
Figs. 1-2 Fig. 1. A specimen of E. japonicus (dorsal view) recovered from a naturally infected man (Case No. 3 in Table 1), showing its prominent head crown with some collar spines, two uterine eggs (black), and several other organs. Acetocarmine stained (Scale: 0.2mm).
Fig. 2. Another specimen (ventral view) from Case No. 4, showing ventral sucker, cirrus sac, ovary and two testes. But no egg is seen in this specimen. Acetocarmine stained (Scale: 0.2mm).
Figs. 3-4 Fig. 3.Ibid (dorsal view), from Case No. 4, showing oral sucker (os), pharynx (ph), cirrus sac (cs), ventral sucker (vs), one uterine egg (e), ovary (ov), and testes (t). Note the distribution of vitelline glands from the level of ventral sucker to the posterior end of body. Acetocarmine stained (Scale: 0.2mm).
Fig. 4. A drawn figure of the worm in Fig. 3 (Scale: 0.2mm).
Figs. 5-6 Fig. 5. Magnification of the head crown with collar spines (arrows) in a worm from Case No. 4. Note the shape and arrangement of spines (Scale: 0.02mm).
Fig. 6. Two uterine eggs of E. japonicus, showing their characteristic shape and a small operculum on the upper pole portion (Scale: 0.02mm).
Tables
Table 1 Cases of E. japonicus and/or other helminth infections
Table 2 Measurements* of E. japonicus recovered from 4 human cases
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