Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals.
10.3347/kjp.2013.51.2.191
- Author:
Woon Mok SOHN
1
;
Jong Yil CHAI
;
Byoung Kuk NA
;
Tai Soon YONG
;
Keeseon S EOM
;
Hansol PARK
;
Duk Young MIN
;
Han Jong RIM
Author Information
1. Department of Parasitology and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 660-751, Korea.
- Publication Type:Original Article
- Keywords:
Echinostoma macrorchis;
snail;
metacercaria;
adult;
rat;
cat;
Vientiane;
Lao PDR
- MeSH:
Animal Experimentation;
Animal Structures/anatomy & histology;
Animals;
Biometry;
Cats;
Echinostoma/anatomy & histology/*isolation & purification;
Laos;
Microscopy/methods;
Parasitology/methods;
Rats;
Snails/*parasitology
- From:The Korean Journal of Parasitology
2013;51(2):191-196
- CountryRepublic of Korea
- Language:English
-
Abstract:
The echinostome metacercariae encysted in Cipangopaludina sp. snails that were purchased from a market in Vientiane Municipality, Lao PDR, were identified as Echinostoma macrorchis (Digenea: Echinostomatidae) through recovery of adult flukes after experimental infection to rats and a cat. The metacercariae were round, 113-128 (121)x113-125 (120) microm, having a thick cyst wall, a head collar armed with collar spines, and excretory granules. The adult flukes recovered from the rats and cat at day 14 and 30 post-infection, respectively, were elongated, ventrally curved, and 3.9-6.3x0.7-1.1 mm in size. The head collar was distinct, bearing 43-45 collar spines with 5 angle spines on each side. Two testes were large (as the name implies), tandem, and slightly constricted at the middle, with irregular margins. Eggs were operculated, ovoid to elliptical, and 88-95x56-60 microm. In scanning electron microscopy, the head collar was prominent, with 43-45 collar spines. Scale-like tegumental spines were densely distributed on the ventral surface between the oral and ventral suckers. Sensory papillae were distributed mainly on the tegument around the 2 suckers. It is confirmed that E. macrorchis is distributed in Lao PDR using Cipangopaludina sp. snails as the second intermediate host.
