1. Department of Microbiology; Niigata College of Pharmacy; Niigata Niigata 950-2081 Japan
2. Gamaleya Institute; Russian Academy of Medical Sciences; Moscow 123098 Russia
3. Department of Parasitology; Aichi Medical University; Aichi 480-1195 Japan
4. Siberian Branch; Russian Academy of Medical Sciences; Vladivostok 690600 Russia