<i>qnr</i> Prevalence in Ceftazidime-Resistant <i>Enterobacteriaceae</i> Isolates from the United States
Ari Robicsek(Massachusetts General Hospital), Jacob Strahilevitz(Massachusetts General Hospital), D.F. Sahm, George A. Jacoby(Lahey Hospital and Medical Center), David C. Hooper(Massachusetts General Hospital)
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Abstract
We screened 313 ceftazidime-resistant Enterobacteriaceae isolates obtained in the United States from 1999 to 2004 for all three known qnr genes. A qnr gene was present in 20% of Klebsiella pneumoniae isolates, 31% of Enterobacter sp. isolates, and 4% of Escherichia coli isolates. qnrA and qnrB occurred with equivalent frequencies and, except for qnrB in enterobacters, were stable over time. qnrS was absent.
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