β-lactamases responsible for resistance to expanded-spectrum cephalosporins in Klebsiella pneumoniae, Escherichia colt, and Proteus mirabills isolates recovered in South Africa

J. D D Pitout, K. S. Thomson, Nancy D. Hanson, A. F. Ehrhardt, E. S. Moland, C. C. Sanders

Research output: Contribution to journalArticle

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Abstract

Although resistance to the expanded-spectrum cephalosporins among members of the family Enterobacteriaceae lacking inducible β-lactamases occurs virtually worldwide, little is known about this problem among isolates recovered in South Africa. Isolates of Klebsiella pneumoniae, Escherichia coli, and Proteus mirabilis resistant to expanded-spectrum cephalosporins recovered from patients in various parts of South Africa over a 3-month period were investigated for extended-spectrum β-lactamase production. Antibiotic susceptibility was determined by standard disk diffusion and agar dilution procedures. Production of extended-spectrum β-lactamases was evaluated by using the double-disk test, and the β-lactamases were characterized by spectrophotometric hydrolysis assays and an isoelectric focusing overlay technique which simultaneously determined isoelectric points and general substrate or inhibitor characteristics. DNA amplification and sequencing were performed to confirm the identities of these enzymes. The P. mirabilis and E. coli isolates were found to produce TEM26-type, SHV-2, and SHV-5 extended-spectrum β-lactamases. An AmpC-related enzyme which had a pI of 8.0 and which conferred resistance to cefoxitin as well as the expanded- spectrum cephalosporins was found in a strain of K. pneumoniae. This is the first study which has identified organisms producing different extended- spectrum β-lactamases from South Africa and the first report describing strains of P. mirabilis producing a TEM-26-type enzyme. The variety of extended-spectrum β-lactamases found among members of the family Enterobacteriaceae isolated from major medical centers in South Africa is troubling and adds to the growing list of countries where these enzymes pose a serious problem for antimicrobial therapy.

Original languageEnglish
Pages (from-to)1350-1354
Number of pages5
JournalAntimicrobial Agents and Chemotherapy
Volume42
Issue number6
StatePublished - 1998

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Escherichia
Proteus
Klebsiella pneumoniae
Cephalosporins
South Africa
Proteus mirabilis
Enterobacteriaceae
Enzymes
Escherichia coli
Cefoxitin
Isoelectric Point
Isoelectric Focusing
DNA Sequence Analysis
Agar
Hydrolysis
Anti-Bacterial Agents
Therapeutics

All Science Journal Classification (ASJC) codes

  • Pharmacology (medical)

Cite this

β-lactamases responsible for resistance to expanded-spectrum cephalosporins in Klebsiella pneumoniae, Escherichia colt, and Proteus mirabills isolates recovered in South Africa. / Pitout, J. D D; Thomson, K. S.; Hanson, Nancy D.; Ehrhardt, A. F.; Moland, E. S.; Sanders, C. C.

In: Antimicrobial Agents and Chemotherapy, Vol. 42, No. 6, 1998, p. 1350-1354.

Research output: Contribution to journalArticle

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