Klebsiella pneumoniae strains carrying the chromosomal SHV-11 beta-lactamase gene produce the plasmid-mediated SHV-12 extended-spectrum beta-lactamase more frequently than those carrying the chromosomal SHV-1 beta-lactamase gene.

The Journal of antimicrobial chemotherapy

PubMedID: 16595640

Lee YH, Cho B, Bae IK, Chang CL, Jeong SH. Klebsiella pneumoniae strains carrying the chromosomal SHV-11 beta-lactamase gene produce the plasmid-mediated SHV-12 extended-spectrum beta-lactamase more frequently than those carrying the chromosomal SHV-1 beta-lactamase gene. J Antimicrob Chemother. 2006;57(6):1259-61.
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