1. University of Science and Technology, Daejeon 305-350, Republic of Korea
2. Viral Infectious Disease Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Republic of Korea
3. Research Unit, Green Cross Veterinary Products, Yong-In 449-903, Republic of Korea
4. National Veterinary Research and Quarantine Service, Anyang 430-824, Republic of Korea
5. Department of Veterinary Medicine Virology Laboratory, College of Veterinary Medicine, BK21 Program for Veterinary Science, Seoul National University, Kwanak-gu, Seoul 151-742, Republic of Korea
6. Bionote, Hwasung, Republic of Korea
7. International Vaccine Institute, Laboratory Science Division, Republic of Korea
8. Department of Infectious Diseases, St Jude Children’s Research Hospital, Memphis, TN 38105, USA