Table 2.

The interpretive criteria and terms used for the evaluation of AST data and the proposed interpretive criteria and terms for biocide susceptibility testing of planktonic cells.

Antimicrobial Susceptibility Testing		Biocide Susceptibility Testing
Definitions	Interpretive Criteria	Proposed Definitions	Interpretive Criteria
Clinical resistance Isolates are not inhibited by the concentrations of the agent usually achievable with normal dosage schedules at the site of infection and/or test results fall into the range in which specific microbial resistance mechanisms are likely, and clinical efficacy of the agent has not been reliably shown.	Clinical breakpoints	Resistance (application-related) Isolates are neither killed nor inhibited by a biocide concentration attained in practice.	In-use concentrations
Wildtype/Non-wildtype Bacterial populations are separated into those without and with acquired resistance mechanisms based on their phenotypes.	Epidemiological cutoff values	Wildtype/Non-wildtype A non-wildtype isolate is neither killed nor inhibited by a biocide concentration at which the majority of isolates of the same species are killed or inhibited.	Epidemiological cutoff values