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A simple two-step method for the identification of Gram negative fermentative rods is based on interpretation of test results by means of a computer-generated diagnostic register. The first step is based on 10 tests, the second on six. Of 1451 strains routinely isolated in clinical laboratories 84% were identified in the first step. If the second step was included, the efficacy of the system rose to 99.17%. Disagreements with the conventional method in the first step are discussed.

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