1. Laboratory of Veterinary Parasitology, Faculty of Agriculture, Iwate University, 3–18–8 Ueda, Morioka, Iwate 020–8550, Japan
2. Department of Pathogenetic Veterinary Science, the United Graduate School of Veterinary Science, Gifu University, 1–1 Yanagido, Gifu 501–1193, Japan
3. Department of Aquatic Animal Health Management Sri Venkateswara Veterinary University College of Fishery Science, Muthukur 524 344 SPSR Nellore, Andhra Pradesh, India
4. Department of Microbiology, Sikkim Manipal Institute of Medical Sciences, Sikkim Manipal University, Gangtok, Sikkim, India
5. Department of Parasitology, National Institute of Infectious Diseases, Tokyo, Japan