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

Tháng Mười 11, 2017

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

Jong-Yil Chai1, Woon-Mok Sohn2,*, Byoung-Kuk Na2 and Nguyen Van De3
1Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea; 2Department of
Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea;
3Department of
Parasitology, Hanoi Medical University, Hanoi, Vietnam

Abstract: We detected metacercariae of Echinostoma revolutum in Filopaludina sp. snails purchased from a local market
in Nam Dinh Province for the frst 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 identifed 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.
Key words: Echinostoma revolutum, Echinostoma jurini, echinostome, metacercaria, Filopaludina snail, Vietnam

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