Differential susceptibility to carbapenems due to the AdcABC efflux pump among nosocomial outbreak isolates of Acinetobacter baumannii in a Chinese hospital

作者：Huang Lei; Sun Liying; Xu Guobing^*; Xia Tiean

来源：Diagnostic Microbiology and Infectious Disease, 2008, 62(3): 326-332.

DOI：10.1016/j.diagmicrobio.2008.06.008

• Acinetobacter baumannii
• Nosocomial outbreak
• Carbapenem resistance
• Efflux pump
• adeB gene

A nosocomial outbreak of carbapenem-resistant Acinetobacter baumannii occurred from February to November 2004 in the surgical intensive care unit (SICU) and the pediatric intensive care unit (PICU) of our hospital. Two separate clones prevailed, the antimicrobial susceptibility profiles of which were different. The PICU isolates produced OXA-23 oxacillinase, whereas no carbapenemases were detected from SICU isolates. No obvious outer membrane protein change was seen. Efflux pump phenotype was detected from SICU isolates. Efflux pump-encoding gene adeB was positive in these isolates and negative in PICU isolates. Through further study, we found that AdeABC efflux system gene contents were common in the SICU isolates. Then we compared the expression level of adeB in resistant and susceptible isolates using quantitative real-time polymerase chain reaction and found that increased expression of AdeABC efflux pump may play an important role in reduced meropenem susceptibility among A. baumannii in the SICU of our hospital.

• 出版日期2008-11
• 单位北京大学