Studies on intestinal trematodes in Korea XIV. Infection status of loaches with metacercariae of Echinostoma cinetorchis and their development in albino rats
Seo, Byong Seol , Park, Yang Hee , Chai, Jong Yil , Hong, Sung Jong , Lee, Soon Hyung
The metacercariae of Echinostoma cinetorchis (Trematoda: Echinostomatidae) were found infected in the loaches (Misgurnus anguillicaudatus) purchased from two local markets in Korea. Identification of the metacercariae was done after obtaining adult worms from experimentally infected albino rats. Brief course of worm development in rats was also observed up to 28th post-infection day. The results are as follows: The metacercariae of E. cinetorchis were detected from 5 (10.9 percent) out of 46 loaches examined and the average metacercarial burden per infected loach was 34.4. They were always found from the posterior abdominal wall. The worm recovery rate from 8 rats was 24.6 percent in average. It was observed that the rate decreased according to age of infection; from 40.7 percent after 6 days to 15.0 percent after 28 days. The adult worms were morphologically characterized by the presence of head crown with dorsally uninterrupted collar spines, 37-38 in number, and the tendency of migration or disappearance of testes. So that they were identified as Echinostoma cinetorchis Ando et Ozaki, 1923. The development of worm was very rapid during 6-10 days after infection and became much slower thereafter.
During the rapid worm growth the development of genital organs was more prominent than that of non-genital organs.
From the results it is concluded that the loach is involved in the life cycle of E. cinetorchis in this country and may take a role for infection source to animals and man. It is also confirmed that migration or loss of testes is the distinct specific character of this echinostomatid fluke.
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