期刊
ANTIMICROBIAL AGENTS AND CHEMOTHERAPY
卷 44, 期 8, 页码 2182-2184出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/AAC.44.8.2182-2184.2000
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资金
- Wellcome Trust Funding Source: Medline
Despite the large number of in vitro mutations that increase resistance to extended-spectrum cephalosporins in TEM-type beta-lactamases, only a small number occur in naturally occurring enzymes, In nature, and particularly in the hospital, bacteria that contain beta-lactamases encounter simultaneous or consecutive selective pressure with different beta-lactam molecules. All variants obtained by submitting an Escherichia coli strain that contains a bla(TEM.1) gene to fluctuating challenge with both ceftazidime and amoxicillin contained only mutations previously detected in naturally occurring beta-lactamases, Nevertheless, some variants obtained by ceftazidime challenge alone contained mutations never detected in naturally occurring TEM beta-lactamases, suggesting that extended-spectrum TEM variants in hospital isolates result from fluctuating selective pressure with several beta-lactams rather than selection with a single antibiotic.
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