Han, Eun-Taek
(Department of Parasitology, Kangwon National University College of Medicine)
,
Shin, Eun-Hee
(Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center)
,
Phommakorna, Souvanny
(Department of Hygiene and Prevention, Ministry of Public Health)
,
Sengvilaykham, Bounthong
(Department of Hygiene and Prevention, Ministry of Public Health)
,
Kim, Jae-Lip
(Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center)
,
Rim, Han-Jong
(Department of Parasitology, College of Medicine, Korea University)
,
Chai, Jong-Yil
(Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center)
The metacercariae of Centrocestus formosanus, a minute intestinal trematode of mammals and birds, were detected in the freshwater fish, Puntius brevis, from Vientiane Municipality, Lao PDR. The metacercariae were experimentally fed to mice, and adult flukes were recovered in their small intestines 7...
The metacercariae of Centrocestus formosanus, a minute intestinal trematode of mammals and birds, were detected in the freshwater fish, Puntius brevis, from Vientiane Municipality, Lao PDR. The metacercariae were experimentally fed to mice, and adult flukes were recovered in their small intestines 7 days later. The adult flukes were morphologically characterized by having 32 (rarely 34) circumoral spines arranged in 2 alternative rows, a large bipartite seminal vesicle, an oval-shaped ovary, and an X-shaped excretory bladder. Based on these characters, the adults were identified as Centrocestus formosanus (Nishigori, 1924). The taxonomic significance of C. formosanus, in relation to a closely related species, C. caninus (Leiper, 1913), is briefly discussed. It has been first verified by adult worm recovery that C. formosanus is prevalent in Vientiane areas of Lao PDR, taking the freshwater fish, P. brevis, as a second intermediate host.
The metacercariae of Centrocestus formosanus, a minute intestinal trematode of mammals and birds, were detected in the freshwater fish, Puntius brevis, from Vientiane Municipality, Lao PDR. The metacercariae were experimentally fed to mice, and adult flukes were recovered in their small intestines 7 days later. The adult flukes were morphologically characterized by having 32 (rarely 34) circumoral spines arranged in 2 alternative rows, a large bipartite seminal vesicle, an oval-shaped ovary, and an X-shaped excretory bladder. Based on these characters, the adults were identified as Centrocestus formosanus (Nishigori, 1924). The taxonomic significance of C. formosanus, in relation to a closely related species, C. caninus (Leiper, 1913), is briefly discussed. It has been first verified by adult worm recovery that C. formosanus is prevalent in Vientiane areas of Lao PDR, taking the freshwater fish, P. brevis, as a second intermediate host.
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제안 방법
The metercariae were fed orally to mice and killed on day 7 postinfection (PI). Their small intestines were resected, opened longitudinally in a Petri dish containing saline, and examined for worms using a stereomiaoscope. The adult flukes were fixed in 10% neutral formalin under a cover slip pressure and stained with Semichon's acetocarmine, cleared in xylene, and mounted in Canada balsam.
성능/효과
Forty-two fish, P. brevis, were examined, and a total of490 me- tacercariae of C. fomu)sanus were harvested from the head with gills. The mean metacercarial density was 11.
4%) were recovered from the small intestine. The adult worms were identified as C. formsanus, based on the following morphological features and measurements (n =10) (Table 1).
caninus is put to a question because of several reasons. First, the number of drcumoral spines is 26-30 in C. caninus [4, 14], whereas that of C. formosanus is 30-36 [1, 3/15], not overlapping significantly. The latter has in most cases 32 spines [1, 3, 15] and rarely 30, 34, or 36 [1].
caninus. Second, C. caninus was originally described based on only 1 specimen obtained from a do응 in Taiwan [14]. The number of drcumoral spines was counted 28, but as the preservation status of the wonn was not 흥ood, it was sueested that some of the spines originally present may have been lost [14, 16, 17].
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