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Volume 11, Number 9—September 2005
Dispatch

β-Lactam Resistance and Enterobacteriaceae, United States

Jean M. Whichard*Comments to Author , Kevin Joyce*, Paul D. Fey†, Jennifer A. Nelson*, Frederick J. Angulo*, and Timothy J. Barrett*
Author affiliations: *Centers for Disease Control and Prevention, Atlanta, Georgia, USA; †University of Nebraska Medical Center, Omaha, Nebraska, USA

Main Article

Table

Characterization of isolates exhibiting increased MIC to extended-spectrum β-lactams among 2000 NARMS*

Isolate/serotype Total no. met MIC criteria/total no. tested (%) Total PCR-positive for blaCMY (%) Total IEF-positive for pl>8.4 (%) No. that produce other β-lactamases
Salmonella
Newport 27/124 (22) 27 (100) 27 (100) 1
Typhimurium 11/303 (3.6) 11 (100) 11 (100) 2
Heidelberg 3/79 (3.8) 3 (100) 3 (100) 1
Other nontyphoidal Salmonella (Agona, Infantis, Muenchen, Nienstedten, Reading) 5/872 (0.57) 3 (60) 3 (60) 1
Shigella sonnei 7/367 (1.9) 0 7 (100) 3
Escherichia coli O157:H7 4/407 (0.98) 4 (100) 4 (100) 0
Total 57/2,152 (2.6) 48 (84) 55 (96) 8

*NARMS, National Antimicrobial Resistance Monitoring System; PCR, polymerase chain reaction; IEF, isoelectric focusing.

Main Article

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Page updated: April 23, 2012
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