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Over a 4-month period from November 2002 to February 2003, 27 ceftazidime-resistant or cefotaxime-resistant nonrepetitive Enterobacter cloacae isolates were collected from 27 patients hospitalized at HuaShan Hospital, Shanghai, People's Republic of China. The Etest did not detect extended-spectrum beta-lactamases (ESBLs) in those 27 isolates; however, screening by the NCCLS ESBL disk test and confirmatory tests detected ESBLs in 4 of 27 isolates and PCR detected ESBLs in 23 of 27 isolates. The majority of ESBL producers exhibited the same repetitive extragenic palindromic PCR pattern but harbored different ESBL genes. CTX-M-3 was the most prevalent ESBL in our study. Interestingly, 12 clonally related E. cloacae isolates possessed a novel bla(VEB)-type beta-lactamase, bla(VEB-3). Bla(VEB-3) was encoded by the chromosome and was located in an integron. Nine of the 12 isolates harbored both the bla(VEB-3) and the bla(CTX-M-3)-like ESBLs. This is the first report of a VEB-1-like ESBL in China and the first report of the simultaneous presence of VEB-1 and CTX-M-3-like ESBLs in an isolate.

Outbreak of Infection Caused by Enterobacter cloacae Producing the Novel VEB-3 Beta-Lactamase in China