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Korean J Parasitol > Volume 33(4):1995 > Article

Original Article
Korean J Parasitol. 1995 Dec;33(4):281-288. English.
Published online Dec 20, 1995.  http://dx.doi.org/10.3347/kjp.1995.33.4.281
Copyright © 1995 by The Korean Society for Parasitology
Image analytical observation on the growth and development of Clonorchis sinensis in rats
Jin Kim*
Department of Pathology, Chonnam University Medical School, Kwangju 501-190, Korea.
Abstract

For the two-dimensional observation on the growth and development of Clonorchis sinensis, an image analysis system (IBAS 2000, Kontron, Germany) was used in this study. On 3, 6, 9, 12, 15, 21, 30 and 90 days of infection, 474 worms were collected from rats infected with 50 metacercariae each. The overall recovery rate was 31.6%. The worms grew rapidly in their length and width up to 30 days of infection and then, did slowly to 90 days of infection. However, the growth pattern of body area was not similar to that of body length and width, because the body area increased continuously even after 30 days of infection. With the image analysis system, the sizes of irregular-shaped genital organs were measured easily, which showed sigmoidal growth patterns. The growth rate of genital organs increased rapidly until 21 days of infection when the uterus was filled with numerous eggs, and then gradually slowed down to 90 days. There was no difference in growth pattern between the anterior and posterior testis. The seminal receptacle, however, showed an abrupt increase in size between 15 to 21 days of infection when it was filled with condensed semen. Therefore, the growth pattern of seminal receptacle might be used as another criteria to estimate the extent of sexual maturation of C. sinensis. From this study, it is suggested that image analysis system is very useful to reveal the growth and development pattern of C. sinensis, especially of their internal organs.

Figures


Fig. 1
Growth curve of Clonorchis sinensis recovered from the infected rats in various periods of infection


Fig. 2
Growth curve of the genital organs of Clonorchis sinensis recovered from the infected rats in various periods of infection

Tables


Table 1
Results of worm recovery from rats experimentally infected with metacercariae of C. sinensis


Table 2
Distribution of worms in the liver of rats


Table 3
Measurement of C. sinensis recovered from the infected rats in various periods of infection

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