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Journal of Clinical Microbiology, 05 1995, 1215-1222, Vol 33, No. 5
Copyright © 1995 by the American Society for Microbiology. All rights reserved.

Comparison of phenotypic characteristics, DNA-DNA hybridization results, and results with a commercial rapid biochemical and enzymatic reaction system for identification of viridans group streptococci

K Kikuchi, T Enari, K Totsuka and K Shimizu
Department of Medicine, Tokyo Women's Medical College Hospital, Japan.

The rapid ID 32 Strep system (bioMerieux, Marcy l'Etoile, France) was evaluated for its ability to identify 21 species of viridans group streptococci; results were compared with DNA-DNA hybridization results and results of conventional physiological tests. A total of 171 strains of the 21 species including 147 clinical strains was analyzed. Of the 156 strains of species included in the database of this system, 136 strains (87%) were correctly identified. Incorrect identification occurred for 13 strains (8%), and no identification was given for 7 strains (5%). It was difficult to differentiate S. mitis and S. oralis accurately with this system. Of the 17 strains identified as S. mitis by the rapid ID 32 Strep system, the results of DNA-DNA hybridization were in agreement for only 3 strains. S. crista and S. parasanguis, which are not included in the database, were identified as S. mitis or S. sanguis or were not identified, but S. parasanguis could probably be identified by using the rapid ID 32 Strep system because the biochemical profile is well characterized for this species. The rapid ID 32 Strep system can be used to differentiate most species for which phenotypic characteristics have been described if the database is revised according to recently reported amended criteria for the identification of viridans group streptococci. However, identification of a few species such as S. mitis and S. oralis is problematic with this system.

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