1. Viral Disease Division, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
2. Veterinary Center, Korea Racing Authority, Gwacheon 13822, Republic of Korea
3. Animal Health Diagnosis Division, Jeju Self-Governing Provincial Veterinary Research Institute, Jeju 63344, Republic of Korea
4. Division of Vaccine Development Coordination, National Institute of Infectious Disease, Cheongju 28160, Republic of Korea