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Echinostoma revolutum: Metacercariae in Filopaludina Snails from Nam Dinh Province, Vietnam, and Adults from Experimental Hamsters

Korean Journal of Parasitology 2011년 49권 4호 p.449 ~ 455
 ( Chai Jong-Yil ) - Seoul National University College of Medicine Department of Parasitology and Tropical Medicine

 ( Sohn Woon-Mok ) - Gyeongsang National University School of Medicine Department of Parasitology and Tropical Medicine
 ( Na Byoung-Kuk ) - Gyeongsang National University School of Medicine Department of Parasitology and Tropical Medicine
 ( De Nguyen Van ) - Hanoi Medical University Department of Parasitology

Abstract


We detected metacercariae of Echinostoma revolutum in Filopaludina sp. snails purchased from a local market in Nam Dinh Province for the first time in Vietnam. Adult flukes were harvested from experimentally infected hamsters at days 14 and 17 post-infection. The metacercariae were round, 170-190 μm (n=15) in diameter, with a cyst wall thickness of about 12 μm. A total of 37 collar spines were arranged around the head collar, and large excretory granules were seen in 2 canals of the excretory bladder. The 14-day old adult flukes were elongated, ventrally curved, and 5.0-7.2×0.8-1.3 mm (n=20). The head collar had a total of 37 collar spines arranged in 2 alternating rows, including 5 corner spines on each side. The cirrus sac contained a saccular seminal vesicle, a prostatic gland, and an unarmed cirrus. Two tandem testes were smooth or slightly lobed. Eggs were ovoid to elliptical, 110-118×70-75 μm. These morphological characters were similar to those of E. revolutum and E. jurini. We tentatively identified it as E. revolutum because the validity of E. jurini remains to be elucidated. The taxonomic relationship of E. revolutum and E. jurini is discussed.

키워드

Echinostoma revolutum; Echinostoma jurini; echinostome; metacercaria; Filopaludina snail; Vietnam
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