Han Eun-Taek, Whang Jong-Dae, Chai Jong-Yil
Department of Parasitology, Kangwon National University College of Medicine, Chuncheon, Kangwon-do 200-701, Korea.
J Parasitol. 2009 Dec;95(6):1415-20. doi: 10.1645/GE-2127.1.
Metacercariae of Himasthla alincia (Echinostomatidae) were discovered in brackish water bivalves in the Republic of Korea; their growth and development were observed in experimental animals. Five species of clams (Mactra veneriformis, Solen grandis, Meretrix petechialis, Cyclina sinensis, and Tapes philippinarum) were found to harbor the metacercariae of H. alincia. Chicks, rats, and mice were orally fed the metacercariae, and worms were recovered from their intestines from day 1 to day 20 postinfection (PI). Only chicks appeared to be a fairly suitable host, although the worm recovery was low, i.e., 1.5% from 17 chicks, and the number decreased from 2.6% on day 1 PI to 1.3% on day 20 PI. Worm development in chicks was quick and remarkable during days 10–20 PI. Adult flukes were morphologically characterized by the presence of a head collar with 31 dorsally uninterrupted collar spines, including 4 end-group spines, and distribution of vitellaria only up to the most posterior margin of the cirrus sac. We verified that several species of brackish water clams are second intermediate hosts for H. alincia, and that its life cycle occurs in the Republic of Korea.
在韩国的咸淡水双壳贝类中发现了阿氏片形吸虫（棘口科）的后尾蚴；在实验动物中观察了它们的生长和发育情况。发现5种蛤（四角蛤蜊、大竹蛏、细纹蚶、青蛤和菲律宾蛤仔）体内带有阿氏片形吸虫的后尾蚴。给雏鸡、大鼠和小鼠口服后尾蚴，并在感染后第1天至第20天从它们的肠道中收集虫体。只有雏鸡似乎是相当合适的宿主，尽管虫体回收率较低，即17只雏鸡的回收率为1.5%，且数量从感染后第1天的2.6%降至第20天的1.3%。在感染后第10 - 20天，雏鸡体内虫体的发育迅速且明显。成虫吸虫的形态特征为有一个头冠，其上有31根在背侧不间断的冠棘，包括4根末端组棘，且卵黄腺仅分布到贮精囊的最后缘。我们证实了几种咸淡水蛤是阿氏片形吸虫的第二中间宿主，且其生命周期在韩国存在。
