In an epidemiologic and case-control study including 30 case patients over a 3.5-year period in a Taiwanese university hospital, only beta-lactamase inhibitor use and extended-spectrum cephalosporin use were identified as independent risk factors for nosocomial CMY-2-producing Escherichia coli bloodstream infection, and CMY-2 producers were found more prevalent than extended-spectrum beta-lactamase-producing isolates.
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Yan et al. (2004) studied this question.
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