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Methods for identifying Neisseria spp. include conventional and modified carbohydrate degradation procedures, chromogenic enzyme substrate tests, and immunologic coagglutination tests for Neisseria gonorrhoeae. In this study, we evaluated the abilities of the RIM-N carbohydrate degradation system (American MicroScan, Campbell, Calif.), the Gonochek II enzymatic identification system (Du Pont Co., Wilmington, Del.), and the Phadebact Gonococcus coagglutination test (Pharmacia Diagnostics, Piscataway, N.J.) to identify pathogenic Neisseria spp. and Branhamella catarrhalis. Both stock strains and clinical isolates, including 176 N. gonorrhoeae, 173 Neisseria meningitidis, 48 Neisseria lactamica, and 12 B. catarrhalis strains, were tested. The RIM-N identified 98% of the gonococci, 99% of the meningococci, 94% of the N. lactamica strains, and 100% of the B. catarrhalis strains within 1 h. The Gonochek II system identified 99% of the gonococci, 97% of the meningococci, 100% of the N. lactamica strains, and 100% of the B. catarrhalis strains within 30 min. Phadebact coagglutination provided clearly positive results for only 77% of the N. gonorrhoeae strains, producing negative or equivocal results with 23% of the strains. The RIM-N and Gonocheck II tests generally produced clear-cut reactions. An additional advantage of the Gonocheck II system was the small inoculum required for the performance of the test compared with the other systems, thus allowing the identification of N. gonorrhoeae directly from the primary isolation medium.

Evaluation of the RIM-N, Gonochek II, and Phadebact systems for the identification of pathogenic Neisseria spp. and Branhamella catarrhalis