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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.
Abstract

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.

Figures


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.

Tables


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

References
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4. Neal RA. Experimental studies on Entamoeba with reference to speciation. Adv Parasitol 1966;4:1–51.
  
5. Seo BS, Lee SH, Cho SY, Chai JY, Hong ST, Han IS, Sohn JS, Cho BH, Ahn SR, Lee SK, Chung SC, Kang KS, Shim HS, Hwang IS. An Epidemiologic Study On Clonorchiasis And Metagonimiasis In Riverside Areas In Korea. Korean J Parasitol 1981;19(2):137–150.
 
6. Soh CT. Parasitic amebae in Korea. Korean J Parasitol 1981;19 Suppl:5–93.
 
7. Intestinal protozoan and helminthic infections. World Health Organ Tech Rep Ser 1981;666:1–150.
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