1. Korean Collection for Type Cultures, Biological Resource Center, Korea Research Institute of Bioscience & Biotechnology, 125 Gwahak-ro, Yuseong-gu, Daejeon 305–806, Republic of Korea
2. California Institute for Medical Research, 2260 Clove Drive, San Jose, CA 95128, USA.
3. Stanford University Medical School, Stanford, CA, USA
4. Division of Infectious Diseases, Department of Medicine, Santa Clara Valley Medical Center, San Jose, CA, USA