[Studies on Clonorchiasis sinensis control in Sanshui City, Guangdong province].

During 1986 to 1988 and 1990 to 1992, Dongyong Township and Guanyuan Township in Sanshui City, Guangdong Province were selected as demonstration areas for clonorchiasis sinensis control by using measures of repeated examination and treatment respectively. After two years' examination and treatment, the population infection rates were from 43.6% to 13.2% in Dongyong Township and from 78.5% to 36.3% in Guanyuan Township. The first intermediate host was Alocimma longicornis, and the second intermediate hosts were Parabramis bransula and Ctenopharyngodon idellus. The adult worms of Clonorchis sinensis were found in the bile ducts of cats, dogs and pigs which may be the reservoir hosts.