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Evaluation of Biolog for identification of members of the family Micrococcaceae.

Hospital Infections Program, Centers for Disease Control and Prevention, Atlanta, Georgia 30333.

ABSTRACT

The Biolog Identification System (Biolog, Inc., Hayward, Calif.) was challenged at two separate laboratories with 113 coded isolates, including 33 type strains of staphylococci, 5 strains of Micrococcus spp., and 1 strain of Stomatococcus mucilaginosus. Test parameters between the sites were controlled as much as possible. Discrepancies were arbitrated by using conventional biochemicals. Overall accuracies (correct to the species level) upon initial testing were 47.7 and 59.3%, respectively, at the two laboratories. After repeat testing of isolates generating "no identification" responses or errors, the overall accuracies increased to 69.0 and 74.3% at the two sites, respectively, revealing no significant difference in the final results at the two laboratories (78 of 113 versus 84 of 113; P > 0.05). Error rates were 7.1% at one site and 9.7% at the other. The Biolog is not yet accurate enough to serve as a primary method for identifying staphylococci.

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