Abstract

GARCIA BLANCAS, Pablo  and  MENDOZA MEDELLIN, Aurelio. Traditional and high-resolution biochemical tests for manual identification of enterobacteria. Acta bioquím. clín. latinoam. [online]. 2014, vol.48, n.2, pp.249-254. ISSN 0325-2957.

A traditional series of biochemical tests-was compared to a high-resolution one in order to identify 500 strains of enterobacteria, using a probabilistic method for the interpretation of experimental results. The traditional series was formed by 10 tests (ornithine decarboxylase, lysine decarboxylase, lysine deaminase, sulfhydric acid, indol and gas production, urea hydrolysis, citrate and malonate utilization, and motility). The high-resolution one was also formed by 10 tests, including the first 4 tests mentioned above and 6 carbohydrate fermentation tests (adonitol, L-arabinose, cellobiose, L-rhamnose, raffinose, and sorbitol). With the high-resolution series, single identities were assigned to 445 strains (351 with a probability of 1.0 and 94 with probabilities in the range 0.010-0.999), and for the remaining strains two and three probable identities were assigned to 53 and 2 strains, respectively. With the traditional series, single identities were assigned to 306 strains (110 with a probability of 1.0 and 196 with probabilities in the 0.001-0.999 range), two and three probable identities were assigned to 179 and 5 strains respectively; 10 strains turned out to be non-identifiable. Every parameter of comparison used revealed the superiority of the high-resolution series. The probabilistic method for interpretation of experimental results allowed an objective comparison of both series.

Keywords : Manual identification; Enterobacteria; Probabilistic method; Biochemical tests.

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