Frequency distribution of Enterobius vermicularis in a highly endemic population

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Abstract
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.