Volume 11, Number 9—September 2005
Dispatch
β-Lactam Resistance and Enterobacteriaceae, United States
Jean M. Whichard*
, Kevin Joyce*, Paul D. Fey†, Jennifer A. Nelson*, Frederick J. Angulo*, and Timothy J. Barrett*
, Kevin Joyce*, Paul D. Fey†, Jennifer A. Nelson*, Frederick J. Angulo*, and Timothy J. Barrett*
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.
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