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Korean J Parasitol > Volume 18(2):1980 > Article

Original Article
Korean J Parasitol. 1980 Dec;18(2):164-170. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1980.18.2.164
Copyright © 1980 by The Korean Society for Parasitology
Chronologic growth pattern of Ascaris lumbrioides
Byong-Seol Seo and Jong-Yil Chai
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.

The chronologic growth patten of Ascaris lumbricoides was made by the maximum length of worms collected from inhabitants after mass chemotherapy with pyrantel pamoate by various interval; 2-month, 4-month, 6-month an 12-month.

The results obtained were summarized as follows:

1. When the collected 497 worms were plotted on weight/length chart by treatment interval, there was always size limitation in each group, permitting the idea of maximal growth in a given period of infection.

2. The maximum lengths in each interval treatment, 2, 4, 6 and 12-month were; 12.5, 16.4 , 19.2 and 22.8 cm in male and 14.2, 22.0, 26.2 and 30.8 cm in female respectively.

3. The maximum growth curves were expressed by the equations; Y=9.212 In(X+1)+0.025 in male and Y=11.953 In(X+1)+0.025 in female when X is age in month and Y is length in cm.

4. It was revealed that female grew more rapidly than male. The growth of length was rapid in initial 2~3 months and weigth gain was rapid in later than 2~3 months. The weight seems better than length as an indicator of aging.


Fig. 1
A scheme of aging the collected A. lumbricoides by pyrantel with considerations of migration phase.

Fig. 2
The distribution pattern of Ascaris lumbricoides by weight and length according to treatment interval.

A: Males from 2-month interval, B: Females from 2-month interval, C: Males from 4-month interval, D: Females from 4-month interval, E: Males from 6-month interval, F: Females from 6-month interval, G: Males from 12-month interval, H: Females from 12-month interval.

Fig. 3
The maximum growth curve of Ascaris lumbricoides revealed by the length.

Fig. 4
The maximum growth curve of A. lumbricoides revealed by the weight.


Table 1
The sources of analysed cases to make growth curve of Ascaris lumbricoides

Table 2
Sex ratio of the collected worms

Table 3
Observed maximum length and weight of Ascaris lumbricoides according to the age

1. Cho SY. Study on the quantitative evaluation of reinfection of Ascaris lumbricoides. Korean J Parasitol 1977;15(1):17–29.
2. Jung RC. The predominance of single-brood infections in human ascariasis. J Parasitol 1954;40(4):405–407.
3. Koino S. Sakingaku Zasshi 1923;334:485–496.
4. Masuda R. Jpn J Parasit 1963;12:119–125.
5. Seo BS, Cho SY, Chai JY, Hong ST. Comparative Efficacy Of Interval Mass Treatment On Ascaris Lumbricoides Infection In Korea. Korean J Parasitol 1980;18(2):145–151.
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