7Lockhart SR, Abramson MA, Beekmann SE, et al. Antimi erobial resistance among Gram-negative bacilli causing infections in intensive care Unit patients in the United States be tween1993 and 2004[J]. J Clin Mierobiol, 2007 , 45 : 3352- 3359.
8Biedenbach DJ, Moet GJ, Jones RN. et al. Occurrence and antimicrobial resistance pattern comparisons among blood- stream infection isolates from the SENTRY Antimicrobial Surveillance Program (1997- 2002) [J]. Diagn Microbiol In fect Dis, 2004,50 (1) : 59-69.
9Hobart DJ, Biedenbach DJ, Mutnick AH, et al. Pathogen of occurrence and susceptibility patterns associated with pneumonia in hospitalized patients in North America: results of the SENTRY Antimicrobial Surveillance Study (2000) [J]. Diagn Microbiol Infect Dis,2003,45(4) :279-285.
