1. School of Veterinary Medicine, Rakuno Gakuen University, 582 Bunkyodai-Midorimachi, Ebetsu, Hokkaido 069-8501, Japan
2. Microbial Solutions, Charles River, 1023 Wappoo Road, Suite 43B, Charleston, SC 29407, USA
3. College of Veterinary Medical Science, Ohio State University, 1900 Coffey Road, Columbus, OH 43210, USA