1. Laboratory of Parasitology, School of Veterinary Medicine, Azabu University, 1-17-71, Fuchinobe, Sagamihara, Kanagawa 252-5201, Japan
2. Faculty of Veterinary Science Rajamangala University of Technology Srivijaya, 133 Moo 5 Thungyai, Nakhon Si Thammarat, 80240, Thailand