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Korean J Parasitol > Volume 21(2):1983 > Article

Original Article
Korean J Parasitol. 1983 Dec;21(2):224-233. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1983.21.2.224
Copyright © 1983 by The Korean Society for Parasitology
Studies on intestinal trematodes in Korea IX. Recovery rate and development of Fibricola seoulensis in experimental animals
Sung-Jong Hong,Soon-Hyung Lee,Byong-Seol Seo,Sung-Tae Hong and Jong-Yil Chai
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.
Abstract

An experimental study was carried out to observe the susceptibility of several kinds of laboratory animals to Fibricola seoulensis infection, a diplostomatid fluke of mammals. The metacercariae were obtained from the viscera of the snakes, Natrix tigrina lateralis and 50-2,000 in number each was artificially fed to a total of 127 animals; albino rats, mice, dogs, cats, rabbits and chickens. After 3 days to 8 weeks the animals were sacrificed and the recovery rate of worms as well as their maturity was observed.

The results are as follows:

1. The overall wom recovery rates throughout the experimental period was highest in albino rats(40.0 %) followed by mice(33.9%), cats(20.9 %), dogs(11.4 %), rabbits(0.05 %) and chickens(0 %). However, the recovery rates in the same host decreased as infection progressed longer and variable by the amount of metacercariae given.

2. From albino rats and mice, the highest recovery rates were obtained in 1,000 and 200 metacercariae infection groups repectively, and it is considerd that such amount should be the optimum dose for experimental infection of these animals.

3. The main location of F. seoulensis in experimental animals was small intestine especially the duodenum.

4. The maturity index (No. mature worms/No. examined) was 100% in albino rats and mice, while only 22.7% or 0% in dogs or cats respectively.

From the results, it is concluded that albino rats and mice are the most susceptible hosts for F. seoulensis infection among six kinds of laboratory animals examined.

Figures


Fig. 1
Chronological recovery rates of F. seoulensis from albino rats, mice, dogs and cats.


Fig. 2
Numerical distribution of F. seoulensis in small intestine of albino rats according to the amount of metacercariae infected.


Fig. 3
Chronological distribution of F. seoulensis in mall intestine of albino rats infected with 200 metacercariae by number of worms.


Fig. 4
Numerical distribution of F. seoulensis in small intestine of mice according to the amount of metacercariae infected.

Tables


Table 1
Number of infected animals according to the amount of metacercariae and duration of infection


Table 2
Recovery rate of F. seoulensis in several hosts by infection period and dose


Table 3
Numerical distribution of F. seoulensis recovered from small intestine of albino rats by infection period and dose


Table 4
Numerical distribution of F. seoulensis recovered from small intestine of several hosts by infection period and dose


Table 5
Ratio of posterior/anterior segments of one week old F. seoulensis collected from several hosts


Table 6
Distribution of worms by the number of intrauterine eggs in one week old F. seoulensis collected from several hosts.


Table 7
Maturity of one week old F. seoulensis collected from several hosts

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