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Korean J Parasitol > Volume 20(1):1982 > Article

Original Article
Korean J Parasitol. 1982 Jun;20(1):43-48. Korean.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1982.20.1.43
Copyright © 1982 by The Korean Society for Parasitology
A survey on the prevalence of intestinal protozoan cysts in Jeonlanam Do, Korea
Sung-Jong Hong,Sung-Tae Hong,Jong-Yil Chai,Soon-Hyung Lee,Byong-Seol Seo,Byong-Hwan Cho and In-Soo Han
Department of Parasitology and Institute of Endemic Diseases, College of Medicine, Seoul National University, Korea.
The Korean Association for Parasite Eradication, Korea.

A survey on the prevalence of intestinal protozoan cysts was conductcd in Jeonlanam Do (Province), Korea in 1981. A total of 4,116 specimens was collected from 2,035 male and 2,086 female inhabitants in 4 urban and 7 rural areas. Each case was selected randomly to represent 1,000 inhabitants referred to the census in 1980. Formalin-Ether sedimentation technique was employed to concentrate the cysts and one Lugol's iodine stained smear was examined for each case.

The results were summarized as follows:

1. The cases who passed out protozoan cysts of any kind were 9.1% out of total 4,116 examined, and cumulative positive rate was 11.0%. Among the positive cases, 16.5% were infected by two or more species of protozoa.

2. Total 5 species of cysts were detected and the positive rates were as follows; Entamoeba histolytica 1.4%, E. Coli, 4.9%, Endolimax nana 2.5%, Iodamoeba butschlii 0.4% and Giardia lamblia 1.9%.

3. The cyst positive rates varied greatly by the surveyed area. The positive rate in rural area was 11.6% compared with 5.7% in urban area. The highest rate was found 14.5% in Gurye Gun (County) and the lowest 3.6% in Mogpo Si (City).

4. Female showed much higher positive rate than male as 11.8% compared with 6.4% and the cumulative rate 14.2% and 7.6% respectively. By age group, the rate was highest as 13.9% in 40-49 years and next 12.5% in over 60 years group.

The cyst prevalence rate diminished remarkably in Jeonlanam Do compared to previous records. However, the finding that 20.2% of females of 40 years were the carrier of protozoan cysts was an important information in public health point of view.


Fig. 1
The areas selected for this survey and their area code in Jeonlanam Do.

Fig. 2
The positive rates of intestinal protozoan cysts by sex and age group in Jeonlanam Do, 1981.


Table 1
The positive rate of protozoan cysts by the surveyed area in Jeonlanam Do in 1981

Table 2
Polyparasitism of 376 cyst positive cases

Table 3
The cyst positive rate by urban and rural area in Jeonlanam Do

Table 4
Cyst positive rate by age and sex in Jeonlanam Do

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