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Korean J Parasitol > Volume 7(3):1969 > Article

Original Article
Korean J Parasitol. 1969 Dec;7(3):129-142. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1969.7.3.129
Copyright © 1969 by The Korean Society for Parasitology
Study on Metagonimus yokogawai(Katsurada, 1912) in Korea I. On the metacercaria, its distribution in the second intermediate host and the development in the final host
Byong Seol Seo and Nam Tae Hong
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.

1) The metacercariae of Metagonimus yokogawai were isolated from the sweetfish Plecoglossus altivelis, clollected at Hwagae, South Kyongsang Do, one of the newly known endemic foci of metagonimiasis in Korea. The body structure of metacercaria of M.yokogawai was described and the measurements of the excysted metacercaria were also made.

2) In order to know the distribution of metacercariae within the host, the rate of infection and the intensity of infection, a total of 10 sweet fishes was examined and it was found all infected, from which a total of 38,511 metacercariae was isolated. The number of metacercariae in a fish varied from 219 to 14,427. The average number of metacercaria per fish was 3,851.

The distribution of metacercariae in the four divided parts of fish was observed in the following order; number of metacercaria in the muscles; 2,417 (62.8%), in the subcutaneous tissues; 1,126.9 (29.3%), and on the scale; 291.9(7.7%).

3. The development of the metacercaria of M. yokogawai in the mouse host was experimentally traced every day for 10 days after infection . In an earlier period of infection, the growth rate of the genital primordia was distinctly high, particularly in the testes. The seminal receptable and seminal vesicle became clearly recognized in measurable size at 4 days after infection. The vitelline follicles and their ducts were also first visible in the living specimens at 6 days after infection. The oral sucker was larger in size than the ventral sucker in an early stage of the worms, however after 7 days after infection it reversed. The posterior part of body began to extend since two days after infection. Fully matured worms were able to collect only after 7 days after infection. At this stage, the body of worm became 0.7 mm long and 0.3 mm wide. The first positive appearance of eggs in the uterine tubule and in feces was on the 6th day and 10th day of infection, respectively.

In an earlier stage of infection, the worms were found mostly in the upper portion of small intestine and the recovery rates of the worms were high, however according to the course of infection in later stage they were seen rather in the lower part of the intestine and the recovery rate also decreased.


Fig. 1
Metacercaria of MMetagonimus yokogawai ventrally bent for revolving movement.

Fig. 2
Distribution of metacercariae of M. yokogawai in the sweetfish, Plecoglossus altivelis.

Fig. 3
Distribution of worms in the intestine and recovery rate by various intervals after infection.

1-5: parts of the small intestine, 6: large intestine

Plate I
Fig. 1 and 2: Metacercaria of M. yokogawai.

Fig. 3: Excysted metacercaria (Formalin fixed, unstained).

Fig. 4: One day-old worm (Formalin fixed, unstained).

Fig. 5: Two day-old worm (Formalin fixed, unstained).

Fig. 6: Three day-old worm (Semichon's acetocarmine stained).

Plate II
Fig. 1: Four day-old worm (Semichon's acetocarmine stained).

Fig. 2: Five day-old worm (Semichon's acetocarmine stained).

Fig. 3: Six day-old worm (Semichon's acetocarmine stained).

Fig. 4: Seven day-old worm (Semichon's acetocarmine stained).

Fig. 5: Eggs in Uterus of the seven day-old worm (unstained).

Fig. 6: Seven day-old worm (Semichon's acetocarmine stained).


Table 1
Measurements of metacercaria of M. yokogawai

Table 2
Distribution of metacercariae of Metagonimus yokogawai in Plecoglossus altivelis

Table 3
Measurements(in average) of Developing Worms in Mouse Host carrying Age of Infection

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