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Epidemiological studies on protozoan infection in Gyeong-gi Do and Jeonra Bug Do
Seok-Chan Kim,Jae-Jin Kim and Keun-Tae Lee
Department of Parasitology, College of Medicine, Yonsei University, Korea.
Abstract
The present study was designed to elucidate the recent prevalence of the intestinal protozoa and to demonstrate the relationship on prevalence of the surveyed population with their academic career and living conditions. During the period from May to July 1981, total 2,735 fecal specimens were collected from the inhabitants of 11 areas in Gyeong-gi Do (province) near by Seoul City, and 6 areas in Jeonra Bug Do, southwestern part of Korea. The samples were fixed with SAF solution and were examined by formalin-ether sedimentation technique. The results are summarized as follows: Overall positive rate of intestinal protozoa was 11.1 percent: Gyeong-gi Do, 10.7 percent; Jeonra Bug Do, 11.7 percent. Five species of intestinal protozoa were detected: Entamoeba histolytica 0.69 percent, Entamoeba coli 5.52 percent, Endolimax nana 2.71 percent, Giardia lamblia 2.23 percent, Iodamoeba butschlii 0.l8 percent. Highest positive rates among the examined areas were recognized: Incheon City of Gyeong-gi Do, 26.7 percent; Im-sil Gun(county) of Jeonra Bug Do, 19.9 percent. By species, E. nana showed the highest prevalence rate (13.74 percent) in Incheon City, and E. histolytica (2.37 percent) and E. coli (9.95 percent) in Im-sil Gun. Prevalence of E. histolytica in rural areas was higher than in urban areas. No significant difference in the prevalence rate by sex and age was recognized, although the group under 10 years and over 60 years were lower than in other age groups. The highest positive rate of E. histolytica was observed in pauper group and significant linearity of prevalence rate of E. histolytica by monthly income was observed. The inhabitants who used conventional latrine showed higher prevalence, 11.5 percent, than the group of inhabitants who used modified privy. Although no significant difference of positive rate was recognized by academic career, but the lowest prevalence rate was observed in college graduates. Over half of the surveyed population, 64.8 percent has no experience on anthelmintic practice. Number of anthelmintic application resulted no difference in prevalence. In conclusion, prevalences of intestinal protozoa in Gyeong-gi Do and Jeonra Bug Do decreased remarkably in comparison with those of one decade before. However, economic level, academic career and anthelmintic administration seemed no essential reasons for such declination.
Figures
Fig. 1 Location of surveyed areas in Gyeong-gi Do and Jeonra Bug Do, Korea
1. Jeon Mi-Dong Jeon Ju, Jeonra Bug Do
2. Dae Jang-Chon, Ig San, Jeonra Bug Do
3. Sam Rye-Ri, Wan Ju, Jeonra Bug Do
4. Jang Hwa-Ri, Gim Je, Jeonra Bug Do
5. Su Keum-Ri, Jeong Eub, Jeonra Bug Do
6. Seo San-ri, Im sil, Jeonra Bug Do
7. Jang Heung-Myeon, Nam Yang Ju, Gyeong-gi Do
8. Su Jin-Dong, Seong Nam, Gyeong-gi Do
9. Jang Ho Won-Eub, I Cheon, Gyeong-gi Do
10. Seo Bu-myeon, Gwang Ju, Gyeong-gi Do
11. Hwa Su-Dong, In Cheon, Gyeong-gi Do
12. Pyeong-Dong, Su Won, Gyeong-gi Do
13. Ja Keum-Dong, Eui Jeong Bu, Gyeong-gi Do
14. Pyeong Taeg-Eub, Pyeong Taeg, Gyeong-gi Do
15. Jin An-Ri, Hwa Seong, Gyeong-gi Do
16. Tan Hyeon-Myeon, Pa Ju, Gyeong-gi Do
17. Yang Chon-Myeon, Gim Po, Gyeong-gi Do
Fig. 2 Comparison of prevalence rate of intestinal protozoa in Jeonra Bug Do during a decade
Tables
Table 1 Surveyed percentage of household and population according to locality
Table 2 Prevalence rate of intestinal protozoa according to province
Table 3 Prevalence rate of intestinal protozoa according to surveyed districts
Table 4 Prevalence rate of intestinal protozoa according to urban and rural area
Table 6 Prevalence rate of intestinal protozoa by age group
Table 7 Prevalence rate of intestinal protozoa by monthly income
Table 8 Prevalence rate of intestinal protozoa by model of toilet
Table 9 Prevalence rate of intestinal protozoa by academic career of surveyed population
Table 10 Prevalence rate of intestinal protozoa by average number of anthelmintic administration per year
Table 11 Prevalence intestinal protozoa according to special reference from 1926 to 1982 in Korea
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