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Korean J Parasitol > Volume 19(1):1981 > Article

Original Article
Korean J Parasitol. 1981 Aug;19(1):38-44. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1981.19.1.38
Copyright © 1981 by The Korean Society for Parasitology
Fluctuation of the egg production amounts according to worm burden and length of Ascaris lumbricoides
Jong-Yil Chai,Sung-Tae Hong,Soon-Hyung Lee and Byong-Seol Seo
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.
Abstract

This study was undertaken to observe the fluctuation pattern of E.P.G. (eggs per gram of feces) according to the number of infected worms and developmental status of Ascaris lumbricoides. The cases were selected from 2,109 inhabitants of Hwasung Gun, Kyunggi Do, Korea, who had received pyrantel treatment in dose of 10 mg/kg during April 1977-May 1980 and who were cooperative enough to collect whole-day stool specimens for 2 days. Among them, 602 cases who had been infected with 1-5 worms were subjected to analysis.

Egg examination was undertaken by means of cellophane thick smear technique and the amount of produced eggs was checked by Stoll's egg counting technique. The Ascaris worms were collected from stool specimens, counted in number in each case, and each worm was measured by length.

The results could be summarized as follows:

1. According to the increase of worm burden per case from l to 5, the egg detection rate increased from 33.4 percent to 95.7 percent. And the same pattern was observed when the only burden was considered.

2. There were ample variations in the individual E.P.G. counts even among the cases with same burden, although the mean E.P.G. counts among the cases were quite proportionately increased from 842 to 3,467 according to the number of female worms, 1-4.

3. However, from the distribution pattern of the number of each grade of E.P.G. count, it was revealed that the lower the number of females the more cases were with low grade of E.P.G.

4. It was observed that the eggs could be detected after the female worm grew longer than 12.6 cm and the amount of eggs increased until the worm became about 25.0 cm, where a plateau was made in E.P.G. 1,300~1,400, and decreased significantly after 27.5 cm. And yet, wide variations in E.P.G. counts were noted even among the worms of similar growth.

5. Accordingly, the E.P.G. value had better be used as a useful index to estimate the intensity of Ascaris infection and to compare the intensity between two communities, rather than be used to estimate the individual worm burden.

Figures


Fig. 1
Mean E.P.G. counts according to the number of worms infected


Fig. 2
Variation of the amount of eggs according to the length of female worm

Tables


Table 1
E.P.G. counts according to worm burden of Ascaris lumbricoides


Table 2
E.P.G. counts in cases with one female with/without male(s)


Table 3
E.P.G. counts in cases with two females with/without male(s)


Table 4
E.P.G. counts in cases with three females with/without male(s)


Table 5
E.P.G. counts in cases with four females with/without male(s)


Table 6
Distribution pattern of E.P.G. counts according to the number of female worms infected


Table 7
E.P.G. counts according to length of female worm in the cases infected with only one female


Table 8
E.P.G. counts according to length of female worm in the cases infected by a female worm combined with a male

References
1. Brown HW, et al. J Parasit 1927;14:88–90.
 
2. Cho SY. Study on the quantitative evaluation of reinfection of Ascaris lumbricoides. Korean J Parasitol 1977;15(1):17–29.
 
3. Hunter GW, et al. J Parasit 1949;35(6) supple:41.
4. Masuda R. Jpn J Parasit 1963;12(2):119–125.
5. Morishita K. Progress of Med Parasitology in Japan 1972;4:1–153.
6. Seo BS, Cho SY, Chai JY. Frequency Distribution of Ascaris Lumbricoides in Rural Koreans with Special Reference on the Effect of Changing Endemicity. Korean J Parasitol 1979;17(2):105–113.
 
7. Seo BS, Cho SY, Chai JY. Egg Discharging Patterns of Ascaris Lumbricoides in Low Worm Burden Cases. Korean J Parasitol 1979;17(2):98–104.
 
8. Seo BS, Chai JY. Effect Of Two-Month Interval Mass Chemotherapy On The Reinfection Of Ascaris Lumbricoides In Korea. Korean J Parasitol 1980;18(2):153–163.
 
9. Stoll NR. Am J Hyg 1923;3:59–70.
10. Stoll NR, et al. Am J Hyg 1926;6 Mar suppl:80–133.
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