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Soon-Hyung Lee,Byong-Seol Seo,Jong-Yil Chai,Sung-Tae Hong,Sung-Jong Hong and Seung-Yull Cho*
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.
*Department of Parasitology, College of Medicine, Chung-Ang University, Korea.
Abstract
Five cases of Diphyllobothrium latum infection were proved by collection of worms after treatment with bithionol, niclosamide or praziquantel, during 1975-1983. The patients were 4 males and one female aged 10-64 years residing in Seoul or Wando-gun, Chollanam-do, Korea. All of them remembered the history of eating several kinds of raw marine fish and 2 persons said they ate the raw flesh of perch, Lateolabrax japonicus. Three among them experienced abdominal pain, 2 natural discharge of a chain of segments, but none revealed any sign of anemia.
The average egg size in stool varied 59-67 × 41-48 µm according to cases. The eggs were characterized by ovoid to elliptical shape, terminal operculum, and distinct abopercular protuberance. One naturally discharged segment (30 cm) and 4 complete strobilae (320~680 cm) with scolices obtained after treatments were examined. The morphological characters of proglottids such as rosette-form uterus with 3-6 loops, vaginal pore included in the cirrus sac, separated seminal vesicle from cirrus sac etc. were all compatible with D. latum. These are the 7th~11th cases of D. latum infection proved by worms in Korea.
Figures
Figs. 1-11 Fig. 1. Typical egg of D. latum from Case 4. Note operculum at anterior terminal portion and abopercular protuberance at posterior end.
Fig. 2. Another egg of D.latum from Case 5. Magnified.
Fig. 3. A complete strobila of D.latum from Case 4. Note the scolex at the thinnest portion.
Fig. 4. Another strobila of D.latum from Case 5 with scolex.
Fig. 5. Magnification of the worm in Fig. 3. Note the contracting scolex nearly in round shape and the terminal segments attenuated as a pointed end.
Fig. 6. Four proglottids from Case 1. Whole mount and acetocarmine stained. Note the cirrus sac, 3~4 uterine loops in rosette form, and ovary.
Fig. 7.Ibid from Cse 2.
Fig. 8. Two proglottids of D.latum from Case 4. Whole mount and acetocarmine stained. Note 5~6 uterine loops in rosette form.
Fig. 9. Longitudinal section of lateral portion of two proglottids from Case 2. H-E stain. Testes are deeply located, interrupted at the junctional portion between proglottids, whereas vitellaria beneath the teguments.
Fig. 10. Magnification of Fig. 6 showing the relationships of cirrus, vaginal and uterine pores. Note the vaginal pore opens within the cirrus sac and the uterine pore beneath the cirrus sac.
Fig. 11. Longitudinal section of mid-portion of two proglottids from Case 2. H-E stain. Seminal vesicle is at upper portion of uterus, not incorporated into cirrus sac. Vaginal pore opens in the cirrus sac. Uterine pore is seen under the cirrus sac.
Tables
Table 1 Summary of case history and result of treatment of Diphyllobothrium latum cases
Table 2 Measurements of eggs and strobilae of D. latum from the present cases
Table 3 Summary of ever-reported D. latum cases proved by worms in Korea
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