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Korean J Parasitol > Volume 23(2):1985 > Article

Original Article
Korean J Parasitol. 1985 Dec;23(2):253-259. Korean.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1985.23.2.253
Copyright © 1985 by The Korean Society for Parasitology
Number of intrauterine eggs in female Enterobius vermicularis by body length
Seung-Yull Cho,Im Won Chang and Hyun Jung Jang
Department of Parasitology and Preventive Medicine, College of Medicine, Chung-Ang University, Seoul 151, Korea.

In order to correlate the number of eggs in female Enterobius vermicularis with their body length and to re-evaluate the number of eggs liberated by gravid females, a total of 203 worms were examined. Those females were removed from naturally infected orphans with mebendazole (100 mg) and had been fixed in 10 percent formalin(Cho et al., 1981). The decent ones which were selected under dissecting microscope were unbroken, neatly fixed females without contaminated eggs on their surface. The worms were measured by their body length, softened in 0.1N NaOH solution overnight, and teased by dissecting needles. And their number of shelled eggs was measured in a counting chamber made as described by Denham et al. (1971). The results were summarized as follows: The observed females, 4.10-9.90 mm long, began to have shelled eggs in uterus when body length was 5.50 mm or longer. The percentage of females with eggs in uterus was as follows by range of body length: 25 percent in 5.50-5.99 mm long, 53.3 percent in 6.00-6.49 mm long, 86.7 percent in 6.50-6.99 mm long, 95.2 percent in 7.00-7.49 mm long and 100 percent in 7.50 mm or longer. The mean and standard deviation of egg number were as follows by the length of females: 19±50 in 5.50-5.99 mm long, 734±1,597 in 6.00-6.49 mm long, 1,473±1,606 in 6.50-6.99 mm long, 1,530±2,055 in 7.00-7.49 mm long, 2,567±2,046 in 7.50-7.99 mm long, 5,598±2,470 in 8.00-8.49 mm long, 9,318-2,651 in 8.50-8.99 mm long, 10,678±2,892 in 9.00-9.49 mm long and 13,323± 1,778 in 9.50-9.90 mm long. The numbers of uterine eggs showed greater individual variation when the female lengths were in range of 5.5-8.0 mm. When the female length was longer than 9.0 mm, the egg numbers were over 10,000 in majority, and showed lesser individual variations. Above results suggested that the egg production in female E. vermicularis began in 28-32 days after infection and that in early stages, the egg production varied by individual worms, but in gravid females longer than 9.0 mm at last deposited 10,000 to 16,000 eggs in their uterus with the least individual variations.


Fig. 1
A chamber for dissection of worms and counting egg numbers (as described by Denham et al., 1971).

Fig. 2
Percentage of female E. vermicularis having eggs in uterus by body length.

Fig. 3
Scattergram of the relationship between the length of female E. vermicularis and their egg numbers. Closed circles (●) indicate worms with eggs. Open circles (○) indicate worms without eggs. Open triangles (△) mean the data reported by Reardon (1938). Broken line indicates the regression curve.

Fig. 4
Mean and standard deviation of egg numbers by range of body length of E. vermicularis. Unbroken line indicates the regression curve drawn by the equation, Y=1.088X11.551610-7.

Fig. 5
Variations of egg numbers by length of E. vermicularis collected from different cases.


Table 1
Distribution of females by egg number in uterus when analyzed by length

1. Akagi K. Nippon Kiseichugakkai Kiji 1952;21:13–16.
2. Cho SY, Hong ST, Kang SY, Song CY. Morphological Observation Of Enterobius Vermicularis Expelled By Various Anthelmintics. Korean J Parasitol 1981;19(1):18–26.
3. Cho SY, Kang SY, Kim SI, Song CY. Effect of anthelmintics on the early stage of Enterobius vermicularis. Korean J Parasitol 1985;23(1):7–17.
4. Denham DA, Dennis DT, Ponnudurai T, Nelson GS, Guy F. Comparison of a counting chamber and thick smear methods of counting microfilariae. Trans R Soc Trop Med Hyg 1971;65(4):521–526.
5. Hulinska D. Folia Parasitologica 1968;15:15–27.
6. Reardon L. Publ Hlth Repts 1938;53:978–984.
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