Analysis of PBP5 of Early U.S. Isolates of Enterococcus faecium: Sequence Variation Alone Does Not Explain Increasing Ampicillin Resistance over Time

Abstract excerpt

Recent studies have shown that ampicillin resistance has increased steadily over the past 3 decades within U.S. Enterococcus faecium isolates. Analysis of the predicted PBP5 protein of 41 isolates showed a consensus PBP5 pattern for the 9 isolates with MICs of <4 μg/ml that is distinctly different from the PBP5 consensus of the 32 isolates with MICs of >4 μg/ml with ∼5% difference between these; however, there...

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