1. Department of Bacteriology, First Affiliated Hospital of Nanchang University, Nanchang University, Nanchang, P.R. China.
2. Department of Infectious Disease, First Affiliated Hospital of Nanchang University, Nanchang University, Nanchang, P.R. China.
3. Department of Hospital Infection Control, First Affiliated Hospital of Nanchang University, Nanchang University, Nanchang, P.R. China.
4. Department of Respiration, The First Affiliated Hospital of Nanchang University, Nanchang, P.R. China.