Normalized resistance interpretation, the NRI method

The normalized resistance interpretation (NRI) method was developed in response to a call for a method to calibrate disc diffusion test results making inter‐laboratory comparisons possible. The main use of NRI so far has been in individual laboratories, in medical and veterinary medicine and in the field of marine microbiology. The applications of NRI for disc diffusion tests are reviewed and, in addition, a detailed description of the calculation procedure is presented. NRI provides a fully objective method for ECOFF calculations of disc diffusion antimicrobial susceptibility test results.

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