Affiliation: | a Department of Microbiology, College of Natural Sciences, Kyungpook National University, Daegu 702-701, South Korea b Animal Disease Diagnostic Center, National Veterinary Research and Quarantine Services, Anyang 430-824, South Korea c College of Veterinary Medicine, Jeju National University, Jeju 690-756, South Korea d College of Veterinary Medicine, Chonbuk National University, Jeonju 561-756, South Korea |