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Two rare cases of Diphyllobothrium latum parvum type infection in Korea
Soon Hyung Lee,1Jong Yil Chai,*1Min Seo,1Jina Kook,1Sun Huh,2Yong Suk Ryang,3 and Yung Kyum Ahn4
1Department of Parasitology and Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
2Department of Parasitology, College of Medicine, Hallym University, Chunchon 200-702, Korea.
3Department of Medical Technology, College of Health Scienses, Yonsei University, Wonju 222-701, Korea.
4Department of Parasitology, Yonsei University Wonju College of Medicine, Wonju 220-701, Korea.
Received May 06, 1994; Accepted May 24, 1994.
Abstract
Two rare cases of human infection with parvum (dwarf) type of Diphyllobothrium latum [syn. D. parvum (Stephens,1908)], were discovered in Korea. The first case was a 46-year old houseife, from whom a kind of pseudophyllidean tapeworm eggs was detected in the feces. She was treated with praziquantel and purged, and a complete strobila with scolex, 120 cm in total length, was recovered. She recalled that she had eaten raw trouts at a raw-fish restaurant near the Chungju Lake. Another patient was a 22-year old medical student (male), who used to eat raw sea-foods. He discovered a chain of tapeworm proglottids, 15 cm in length, discharged spontaneously in his stool and brought it for identification. The worms from the two cases were compatible with D. parvum (Stephens, 1908) of which the taxonomic significance has long been questioned. After a detailed morphological study and review of literature, we designated the worms as D. latum parvum type. This is the first report on the occurrence of this rare type of D. latum infection in Korea.
Figures
Figs. 1-4 Fig. 1. A complete strobila with scolex (SC) of D. latum parvum type recovered from Case 1 after praziquantel treatment. Its whole length was only 120 cm, and the maximum breadth 0.4 cm. Fig. 2. An egg of D. latum parvum type obtained from the feces of Case 1. The operculum (arrows) and the abopercular protuberance (arrowhead) are distinctively seen. Fig. 3. Gravid proglottids of D. latum parvum type discharged from Case 2, showing medially located genital opening and rosette form uterine branches. Acetocarmine stain. Fig. 4. Sagittal section of mature proglottids of D. latum parvum type from Case 2, showing the common genital pore (GP) incorporating the cirrus opening and vagina (V). The cirrus sac (CS), seminal vesicle (SV), and uterine pore (UP) are also distinctively seen. H-E stain.
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