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In a single quantitative study, we measured acrA, acrB, tolC, mdfA, and norE expression in Escherichia coli clinical isolates by using real-time PCR. acrA and acrB overexpression strongly correlated with fluoroquinolone and multidrug resistance; tolC, mdfA, and norE expression did not. The order of abundance of efflux pump transcripts in all fluoroquinolone-susceptible isolates was tolC (highest), then acrA and acrB, and then mdfA and norE. Our findings suggest acrAB overexpression is an indicator of multidrug resistance.

antimicrobial agents and chemotherapy

Expression of Multidrug Efflux Pump Genes acrAB-tolC , mdfA , and norE in Escherichia coli Clinical Isolates as a Function of Fluoroquinolone and Multidrug Resistance