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Korean J Parasitol > Volume 14(2):1976 > Article

Original Article
Korean J Parasitol. 1976 Dec;14(2):109-116. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1976.14.2.109
Copyright © 1976 by The Korean Society for Parasitology
Relationships between the results of repeated anal swab examinations and worm burden of Enterobius vermicularis
Seung-Yull Cho,Shin-Yong Kang,Yong-Suk Ryang and Byong-Seol Seo
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.

To relate the results of repeatedly undertaken anal swabs to worm burden of Enterobius vermicularis in a highly endemic community, 193 rural schoolchildren, divided into 4 groups, were examined daily by Scotch-tape anal swab method, 1, 2, 3 and 4 times respectively. All of the schoolchildren were treated with pyrantel pamoate 10 mg/kg body weight exactly after the last anal swab in each group disregard the results. And all of the expelled E. vermicularis were collected and counted. It was found that 68.8% of total anal swabs were positive and the collection rate of E. vermicularis was 90.7% with average worm burden, 17.0, in surveyed children. From the analyses of the obtained data, following three inferences were derived. The consecutive postive findings of anal swabs could not reduce the possibilities of detecting light worm burden cases when the anal swabs were undertaken daily up to 4 times. The possibilities of detecting the heavy infection cases were found in consecutively positive categories of anal swab and the presence of negative result(s) of anal swab during the consecutive examinations did denote the reduced possibilities of detection heavy infection. The consecutive negative findings in anal swab have tendenicies reducing the possibilities of detecting heavy worm burden cases. Above results were highly suggestive that the processes of infection loss in E. vermicularis were taken place continuously, allowing daily small allotments of discharge of fully gravid worms in heavy infection cases and massive discharge in a very short period of time is practically rare event.


Fig. 1
Distribution pattern of worm burden of E. vermicularis in group I. One dot represents one case.

Fig. 2
Distribution pattern of worm burden of E. vermicularis in group II.

Fig. 3
Distribution pattern of worm burden of E. vermicularis in group III.

Fig. 4
Distribution pattern of worm burden of E. vermicularis in group IV.

Fig. 5
Comparison of distribution patterns of worm burden of E. vermicularis in consecutively negative cases of anal swabs from each group.


Table 1
Conventional indices of Enterobius vermicularis infection in the surveyed schoolchildren in a rural Korean community

Table 2
Results E. vermicularis collection after chemotherapy analysed by the results of anal swabs in each group

Table 3
Analyses on the distribution of cases of graded worm burden by the results of anal swabs

1. Akagi K. Progress of Medical Parasitology in Japan 1973;5:229–279.
2. Chai JY, Cho SY, Kang SY, Seo BS. Frequency Distribution Of Enterobius Vermicularis In A Highly Endemic Population. Korean J Parasitol 1976;14(2):103–108.
3. Cho SY, Kang SY. Significance Of Scotch-tape Anal Swab Technique In Diagnosis Of Enterobius Vermicularis Infection. Korean J Parasitol 1975;13(2):102–114.
4. Chyu I, et al. Theses of Catholic Med College 1963;7:239–244.
5. Moriya S. Osaka Med J 1956;8:81–94.
6. Sadun EH, et al. J Parasitol 1955;41 Suppl:41.
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