Outline of a bacterial filter-based assay to detect beta-lactamases.

Abstract excerpt

We describe a new phenotypic test to detect beta-lactamases. This assay is based on diffusion of beta-lactam/beta-lactamase through a bacterial filter. Beta-lactam hydrolysis on (the other side of) the filter leads to a change in antibiotic susceptibility, which can be measured by disc diffusion tests. We illustrate its ease of use to detect beta-lactamases of different classes.

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