Reference Antimicrobial Susceptibility Testing (AST) Data

CDC programs perform AST of bacterial isolates collected in surveillance programs and isolates submitted to CDC from the reference laboratories for susceptibility testing because of unusual resistance. CDC’s default method is frozen broth microdilution using in-house prepared panels according to standards established by the Clinical and Laboratory Standards Institute (CLSI Document M7). CDC is making these data available online for use in setting breakpoints for interpretation of antimicrobial susceptibility testing.

The downloadable workbooks contain tables and graphic representations that display MIC distributions for various bacteria. We provide a description of the isolates tested with each dataset. CDC will continue to expand this database to include data from other bacteria and data from new antibiotics.

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