1. Laboratory of Avian Diseases, Seoul National University, Seoul 88026, Korea.
2. College of Veterinary Medicine and BK21 PLUS for Veterinary Science, Seoul National University, Seoul 88026, Korea.
3. Center for Infectious Diseases, Korean National Institute of Health, Osong 28159, Korea.
4. Laboratory of Foreign Animal Disease, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea.
5. Laboratory of Avian Diseases, Animal and Plant Quarantine Agency, Gimcheon 39660, Korea.
6. Laboratory of Avian Diseases, College of Veterinary Medicine, Konkuk University, Seoul 05029, Korea.
7. Laboratory of Poultry Production Medicine, Seoul National University, Seoul 88026, Korea.