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

Original Article
Korean J Parasitol. 1976 Dec;14(2):103-108. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1976.14.2.103
Copyright © 1976 by The Korean Society for Parasitology
Frequency distribution of Enterobius vermicularis in a highly endemic population
Jong-Yil Chai,Seung-Yull Cho,Shin-Yong Kang and Byong-Seol Seo
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.

The distribution patterns of worm burden of Enterobius vermicularis were studied in a primary school in rural part of Korea, on July, September and November 1976, for successively three times on 285 children. Out of the subjected children treated with pyrantel pamoate at the dose of 10 mg/kg body weight, 107 in the first, 55 in the second and 43 in the third trials were cooperative in the satisfactory collection of whole amount of feces for three days in respective trials. The distribution patterns of worm burden in these subjected children were considered by statistical analyses for the fitness with theoretical lognormal and negative binomial frequencies. The theoretical values from equations of lognormal distribution was fitted to the observed frequency distibution patterns throughout three trials, but in the second trial undertaken on September 17, 1976, both the lognormal and negative binomial were found to fit the observed data, probably because of rarity of heavy infection cases and high frequency of noninfected cases.


Fig. 1
Distribution pattern of observed frequency of cases with certain number of pinworms per case compared with theoretical values from lognormal and negative binomial distribution in highly endemic population.


Table 1
Infection status of Enterobius vermicularis in the surveyed population in three chemotherapeutic trials

Table 2
Observed frequencies of respective worm burden of E. vermicularis in the surveyed population in three times of trial

Table 3
Parameters of negative binomial and lognormal distributions calculated from observed data and results of χ2 tests with theoretical values

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