Distribution of Bulimus striatulus var. japonicus and Incidence of Natural Infection of Dogs and Cats with Clonorchis sinensis in Okayama Prefecture

Okayam Prefecture is noted as a distribution area of Clonorchis sinensis. We have found K. Nagano (1927) and S. Inatomi (1950) to report on the distribution of Bulimus striatulus var. japonicus. But, lately, we have noticed a change in this distribution during undergo. Then, we have investigated the distribution of Bulimus striatulus var. japonicus at OKayama Prefecture in 1954. By this we found the redusing and restriction of the distribution area of Bulimns striatulus var. japonicus and Clonorchis sinensis of 20.63% from the dogs and 45.54% from the cats of this area.