• CLSI M11-A7

CLSI M11-A7

Methods for Antimicrobial Susceptibility Testing of Anaerobic Bacteria; Approved Standard, M117A7

Clinical and Laboratory Standards Institute , 01/01/2007

Publisher: CLSI

File Format: PDF

$144.00$289.97


Susceptibility testing is indicated for any organism that contributes to an infectious process warranting antimicrobial chemotherapy if its susceptibility cannot reliably be predicted from existing antibiograms. Antimicrobial resistance patterns for many anaerobic bacteria have changed significantly over the last several years, resulting in a lack of predictability for many species. Susceptibility testing of anaerobes is recommended for surveillance purposes and for specific clinical situations.

Two endpoint-determining susceptibility testing methods for anaerobic bacteria are described in this standard. The agar dilution method (Wadsworth) remains the reference standard, and is well suited for surveillance testing and research. It is also the standard to which other methods are compared. Broth microdilution is well suited for the clinical laboratory, but is currently limited to testing of Bacteroides fragilis group organisms and selected antibiotics. Quality control criteria for each procedure are also described.

The tabular information presented represents the most current information for drug selection, interpretation, and quality control. Users should replace tables published in earlier standards with these new tables. (Changes in the tables since the most recent edition appear in boldface type). When new problems are recognized, or improvements in these criteria are developed, changes will be incorporated into future editions of this standard and also distributed as informational supplements.

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