5National Committee for Clinical Laboratory Standard. Performance Standards for Antimicrobial Susceptibility Testing:Twelfth Informational Supplement. M100-S12.Pennsylvania:NCCLS,2002.1-133.
6Clinical and Laboratory Standards Institute/NCCLS.Performance standards for antimicrobial susceptibility testing,Fifteenth informational supplement.CLSI/NCCLS document M100-S15.Clinical and Laboratory Standards Institute Wayne Pennsylvania,2005,25 (1):1-167.
7Kloos WE,Bannerman TL.Update on clinical significance of coagulase-negative staphylococci.Clin Infect Dis,1994,7(1):117-140.
8Edmond MB,Wallace SE,McClish DK,et al.Nosocomial blood stream infections in United States hospitals:a threeyear-analysis.Clin Infect Dis,1999,29(2):239-244.