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Between 1983 and 1994, 13 phenotypically similar unidentified clinical isolates were received by the Special Bacteriology Reference Laboratory, Centers for Disease Control and Prevention (CDC). Sources included blood (four strains), lung (three strains), knee fluid and duodenal tissue (one strain each), bone, and lymph node tissue (two strains each). All were aerobic glucose-oxidizing, slender, long, curved gram-negative rods that utilized xylose, sucrose, and maltose; did not grow on MacConkey agar in 1 to 2 days; were oxidase positive; hydrolyzed esculin; and grew on Campylobacter selective medium. All were negative for urease, indole, nitrate reduction, and gelatin hydrolysis. All were motile by means of a single polar flagellum with a noticeably short wavelength; however, motility was sometimes difficult to demonstrate. The cellular fatty acid compositions of these strains, as analyzed by gas-liquid chromatography, were unique, characterized by relatively large amounts of 16:1omega7c, 16:0, and 18:1omega7c with smaller amounts of 12:0, 3-OH-12:1, 14:0, 15:0, 18:0, Br-19:1, and 19:0cyc11-12. High-performance liquid chromatography and mass spectrometry of the quinone extracts of three representative strains showed ubiquinone-10 as the major component. Based on the breakpoints for the family Enterobacteriaceae, all the strains were susceptible in vitro to aminoglycosides, sulfamethoxazole-trimethoprim, and chloramphenicol but were resistant to most beta-lactams except imipenem. The MICs of amoxicillin-clavulanate and ciprofloxacin for these strains clustered around the breakpoints, which makes it difficult to predict the strains' response in vivo to these agents. This group has been designated CDC oxidizer group 3 (O-3).

journal of clinical microbiology

CDC Group O-3: Phenotypic Characteristics, Fatty Acid Composition, Isoprenoid Quinone Content, and In Vitro Antimicrobic Susceptibilities of an Unusual Gram-Negative Bacterium Isolated from Clinical Specimens