Phenotypic and genotypic characterization of clinical strains of CDC group IVc-2

Gerard J. Osterhout, Joan L. Valentine, James D. Dick

Research output: Contribution to journalArticlepeer-review


CDC group IVc-2 is a gram-negative, oxidase-positive, nonfermentative bacillus that has been implicated in human infections, including septicemia and peritonitis. Biochemically it most closely resembles Bordetella bronchiseptica and Alcaligenes sp. Results of cellular fatty acid (CFA) and 16S rRNA gene analysis were combined with biochemical data to assist in identification and classification. The predominant CFAs were hexadecanoic acid (16:0), cis-9-hexadecanoic acid (16:1ω7c), cis-11-octadecanoic acid (18:1ω7c), and Δ-cis-9,10-methylenehexadecanoic acid (17:0cyc). Small amounts (2 to 5%) of 3-hydroxytetradecanoic acid (3-OH-14:0), tetradecanoic acid (14:0), 2-hydroxyhexadecanoic acid (2-OH-16:0), and Δ-cis-11,12- methyleneoctadecanoic acid (19:0cyc) were also consistently present. The highest 16S rRNA gene similarity was with Ralstonia eutropha and Ralstonia solanacearum. The CFA and 16S rRNA gene sequence data support the inclusion of CDC group IVc-2 in the recently created genus Ralstonia, which includes R. eutropha, R. pickettii, and R. solanacearum.

Original languageEnglish (US)
Pages (from-to)2618-2622
Number of pages5
JournalJournal of clinical microbiology
Issue number9
StatePublished - Sep 1998
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology (medical)


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