1. Department of Microbiology and Immunology; Sun Yat-Sen University of Medical Sciences; Guangzhou Guangdong Province
2. Department of Microbiology; Hainan Medical College; Haikou
3. The Second People's Hospital of Hainan Province; Tongshi County
4. The Hospital of New Star Farm; Baoting County Hainan Province The People's Republic of China
5. Department of Virology, School of Medicine; The University of Tokushima; Tokushima Tokushima 770 Japan