Table 1.

Positive rates of parasite eggs by fecal examination in residents along 5 major rivers

Parasite species	No. positive cases (%)
Overall intestinal parasites	4,052 (9.5)
Helminths
Clonorchis sinensis	3,586 (8.4)
Metagonimus spp.	411 (1.0)
Trichuris trichiura	63 (0.1)
Echinostoma spp.	12 (0.03)
Hookworm	5 (0.01)
Ascaris lumbricoides	4 (0.01)
Gymnophalloides seoi	4 (0.01)
Strongyloides stercolalis	4 (0.01)
Trichostrongylus orientalis	1 (0.002)
Diphyllobothrium sp.	1 (0.002)
Co-infection
C. sinensis+Metagonimus spp.	78 (0.18)
C. sinensis+Echinostoma spp.	7 (0.02)
C. sinensis+T. trichiura	5 (0.01)