Department of Virology;
School of Public Health;
Shandong University;
Jinan 250012;
Shandong;
China;
The Second Hospital of Shandong University;
Jinan 250033;
Shandong;
China;
Linyi People's Hospital;
Linyi 276000;
Shandong;
China;
Shandong Medical Equipment Quality Supervision and Inspection Center;
Key Laboratories of Biological Evaluation;
Jinan 250101;
Shandong;
China;
Shandong Center for Disease Control and Prevention;
Jinan 271100;
Shandong;
China;
Department of Pathology;
University of Texas Medical Branch;
Galveston TX 77555-0609;