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J Clin Microbiol. 1994 May; 32(5): 1302-1307

Identification of five Peptostreptococcus species isolated predominantly from the female genital tract by using the rapid ID32A system.

Department of Biology, University of Ottawa, Ontario, Canada.

ABSTRACT

The rapid ID32A kit (bioMérieux Vitek, Inc., Hazelwood, Mo.) was evaluated for its ability to identify Peptostreptococcus species compared with conventional biochemical tests and gas-liquid chromatography (Virginia Polytechnic Institute), the current "gold standard" method. A total of 5 Peptostreptococcus American Type Culture Collection strains and 95 clinical isolates comprising Peptostreptococcus anaerobius, P. asaccharolyticus, P. magnus, P. micros, and P. prevotii isolates were included for analysis. Overall, the sensitivity and specificity of the rapid ID32A kit in the identification for five Peptostreptococcus species compared with the Virginia Polytechnic Institute method were 93 and 80%, respectively. All P. anaerobius (n = 20) and P. asaccharolyticus (n = 25) isolates were identified with 100% sensitivity and 100% specificity. For the identification of P. magnus (n = 24) and P. micros (n = 19), the rapid ID32A kit was 100% sensitive for both species; the specificity for P. magnus was 95.8% and that for P. micros was 57.9%. The sensitivity and specificity of the rapid ID32A kit for identification of P. prevotii (n = 12) were poor (41.7 and 8.3%, respectively). The rapid ID32A kit is a useful method for the rapid differentiation of P. anaerobius and P. asaccharolyticus from other Peptostreptococcus spp. Conventional methods should be used to identify to the species level isolates of P. magnus, P. micros, and P. prevotii.

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