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Korean J Parasitol > Volume 29(3):1991 > Article

Original Article
Korean J Parasitol. 1991 Sep;29(3):235-243. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1991.29.3.235
Copyright © 1991 by The Korean Society for Parasitology
Prevalence of Enterobius vermicularis infection and preventive effects of mass treatment among children in rural and urban areas, and children in orphanages
J S Kim,H Y Lee and Y K Ahn*
Department of Pediatrics, Yonsei University Wonju College of Medicine, Wonju 220-050, Korea.
*Department of Parasitology, Yonsei University Wonju College of Medicine, Wonju 220-050, Korea.

An epidemiological study and mass treatments of Enterobius vermicularis infection among children near Wonju area of Kangwon province were carried out. The children were divided into 4 groups according to their residing localities; children in the mountainous area, rural area, urban area and in orphanage. They were examined by adhesive cellotape anal swab technique, and egg positive rates were obtained. The rates of egg reduction and re-infection rates after repeated mass treatments were also observed.

The results obtained were as follows:

1. The overall egg positive rate of E. vermicularis in the first screening was 19.9% (251 out of 1,262 examinees; 19.7% in males and 20.1% in females). The positive rates were 13.0% in the mountainous area, 11.9% in the rural area, 15.1% in the urban (medium-sized) area and 61.9% in orphanages.

2. The highest positive rates were observed in the kindergarten children, and 1st and 2nd grade children of primary schools (26.2-32.2%), and the lowest rate (13.6%) in 6-year grade children of primary schools.

3. Cumulative detection rates from 3 repeated anal swabs at 4-5 days interval were higher (70.8%) than those from single anal swabs (50.0-59.2%).

4. Out of the examinees who showed the highest cumulative positive rate (70.8%), about 39.2% were consecutively positive in 3 anal swabs. Among different groups of children, the higher the total egg detection rates (87.5%), the higher the consecutive positive rates (71.9%).

5. A total of 2,609 (male: female = 1:12.4) worms were collected from 17 egg-positive cases treated with anthelmintics. The mean number of worms per child was 153 (range: 4-824).


Fig. 1
Egg detection rate of E. vermicularis by grade of primary school and pertinent age.

Fig. 2
Changing pattern of egg detection rate after repeated mass treatment in schoolchildren and orphans.

Treatment A)~C): Against only egg detected cases at every time(◦), D)~E): Against all subjected children unrelated positive and negative at every time(•)


Table 1
Egg detection rates of Enterobius vermicularis by anal swab technique among children nearby Wonju-city area

Table 2
Comparison of E. vermicularis infection by living environment among children nearby Wonju-city area

Table 3
Distribution of E. vermicularis infection by grand of class (primary school) and age

Table 4
Results of repeated examination by anal swab technique for grasp of E. vermicularis infection

Table 5
Comparison of egg-detected conditions (consecutive and alternative) in infected children by repeated exanimation

Table 6
Infection intensity of worms by chemotherapy

Table 7
Evaluation of repeated anthelmintic treatment of E. vermicularis infection in primary school and orphanages

Table 8
Egg detection rate of brothers or sisters among schoolchildren infected with E. vermicularis

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