| Byung-Suk Cheun | 1 Article |
<b>Objectives</b><br/>
The prevalence of <i>Clonorchis sinensis</i> infection was investigated among residents of the five major river basins, that is, Hangang, Nakdonggang, Seomjingang, Yeongsangang, and Geumgang River basins in Korea.<br/><b>Methods</b><br/>
From January to December 2007, a total of 31,268 stool samples were collected from 29 localities and examined by the formalin-ether sedimentation technique.<br/><b>Results</b><br/>
Intestinal parasite eggs and/or protozoan cysts were detected from 2957 (9.5%) inhabitants. Number of residents harbouring helminth eggs in the faeces was 2542 (8.1%) for <i>C. sinensis</i>, 255 (0.8%) for <i>Heterophyes</i> spp., 36 (0.1%) for <i>Echinostoma</i> spp., 30 (0.1%) for <i>Trichuris trichiura</i>, 8 (0.03%) for <i>Ascaris lumbricoides</i>, 7 (0.02%) for <i>Gymnophalloide seoi</i>, and 50 (0.02%) for <i>Trichostrongylus orientalis</i>. Number of residents harbouring protozoan cysts in the faeces was 133 (1.3%) for <i>Entamoeba</i> spp. and 50 (0.2%) for <i>Giardia lamblia.</i> The positive rates of <i>C. sinensis</i> in Nakdonggang, Seomjingang, Yeongsangang, Geumgang, and Hangang River basins were 12.2%, 9.5%, 3.3%, 3.0%, and 1.0%, respectively. The egg positive rate of <i>C. sinensis</i> was higher in male (10.6%) than in female (6.1%), and the age group of 50s had the highest positive rate (10.4%).<br/><b>Conclusion</b><br/>
The result of this study revealed little decrease in positive rate of <i>C. sinensis</i> compared with the result of southern endemic areas of Korea in 2006.
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