Prevalence of Clonorchis sinensis Infections Along the Five Major Rivers in Republic of Korea, 2007.

Objectives: The prevalence of Clonorchis sinensis infection was investigated among residents of the five major river basins, that is, Hangang, Nakdonggang, Seomjingang, Yeongsangang, and Geumgang River basins in Korea.

Methods: 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.

Results: Intestinal parasite eggs and/or protozoan cysts were detected from 2957 (9.