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Current CLSI recommendations for detecting and confirming ESBL-producing organisms apply only to E. coli, Klebsiella pneumoniae, Klebsiella oxytoca, and Proteus mirabilis. Although Pseudomonas aeruginosa may produce OXA-type ESBLS and PER-type ESBLs (and rare other types), and Acinetobacter may produce PER-1 type ESBLs, no standardized screening methods have been published by CLSI. Please review the following reference:
Bradford, P. 2001. Extended-spectrum beta-lactamases in the 21st century: characterization, epidemiology, and detection of this important resistance threat. Clin Microbiol Rev 14:933-951.
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