Molecular characterization of imipenem-resistant, cfiA-positive Bacteroides fragilis isolates from the USA, Hungary and Kuwait

J. Sóki, Eleonóra Fodor, David W. Hecht, Richard Edwards, Vincent O. Rotimi, Irén Kerekes, E. Urbán, E. Nagy

Research output: Contribution to journalArticle

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Abstract

Fifteen Bacteroides fragilis isolates from the USA, Hungary and Kuwait were examined for carbapenem resistance, for carbapenemase activity and, with the use of various PCR-based methods and nucleotide sequencing, for cfiA genes and activating insertion sequence (IS) elements. All the B. fragilis isolates were cfiA-positive, 10 of the cfiA genes being upregulated by IS elements that are already known. Of these 10, one was of a novel type (designated IS943) and two further ones (IS614B and IS614C) were suspected hybrids of IS612, IS614 and IS942. There were five cfiA-positive imipenem-resistant B. fragilis isolates with elevated imipenem MICs (minimal inhibitory concentration) that harboured no IS insertion upstream of the cfiA gene, but produced carbapenemase; these isolates might possess a novel activation mechanism. On the basis of the available phenotypic and genotypic evidence, the present data suggest that there are at least two cfiA activation mechanisms among B. fragilis isolates.

Original languageEnglish
Pages (from-to)413-419
Number of pages7
JournalJournal of Medical Microbiology
Volume53
Issue number5
DOIs
Publication statusPublished - May 2004

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Kuwait
Bacteroides fragilis
Hungary
Imipenem
DNA Transposable Elements
Insertional Mutagenesis
Carbapenems
Genes
Nucleotides
Polymerase Chain Reaction
carbapenemase

ASJC Scopus subject areas

  • Microbiology (medical)
  • Microbiology

Cite this

Molecular characterization of imipenem-resistant, cfiA-positive Bacteroides fragilis isolates from the USA, Hungary and Kuwait. / Sóki, J.; Fodor, Eleonóra; Hecht, David W.; Edwards, Richard; Rotimi, Vincent O.; Kerekes, Irén; Urbán, E.; Nagy, E.

In: Journal of Medical Microbiology, Vol. 53, No. 5, 05.2004, p. 413-419.

Research output: Contribution to journalArticle

Sóki, J. ; Fodor, Eleonóra ; Hecht, David W. ; Edwards, Richard ; Rotimi, Vincent O. ; Kerekes, Irén ; Urbán, E. ; Nagy, E. / Molecular characterization of imipenem-resistant, cfiA-positive Bacteroides fragilis isolates from the USA, Hungary and Kuwait. In: Journal of Medical Microbiology. 2004 ; Vol. 53, No. 5. pp. 413-419.
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