PHENOTYPIC CHARACTERISTICS, FATTY-ACID COMPOSITION, AND ISOPRENOID QUINONE CONTENT OF CDC GROUP-IIG BACTERIA

Eleven strains of eugenic, nonoxidative, gram-negative rods isolated f rom clinical specimens formed a distinct group that was designated CDC group IIg. Five of the 11 isolates were from wounds. The phenotypic c haracteristics of CDC group IIg were most similar to those of Weeksell a species, with the major difference being that CDC group IIg strains grew on MacConkey agar in 1 to 2 days, did not hydrolyze gelatin, and did not produce urease. All 11 strains of CDC group IIg possessed a di stinct fatty acid profile that was characterized by large amounts (19 to 29%) of 18:1 omega 7c, 16:0, and 16:1 omega 7c, moderate amounts (6 to 10%) of 3-OH-14:0 and 14:0, and smaller amounts (1 to 2%) of 18:2, 18:0, and 3-OH-16:0. This fatty acid profile differs from those of We eksella species by the absence of branched-chain fatty acids, CDC grou p IIg contains ubiquinone-8, as opposed to menaquinone-6 in Weeksella species. The isolates were susceptible to a variety of antimicrobial a gents, including the aminoglycosides, tetracyclines, quinolones, sulfo namides, and polymyxin B.