ß-lactamase characterization in Escherichia coli isolates with diminished susceptibility or resistance to extended-spectrum cephalosporins recovered from sick animals in Spain

  1. Briñas, L. 1
  2. Moreno, M.A. 2
  3. Teshager, T. 2
  4. Zarazaga, M. 1
  5. Sáenz, Y. 1
  6. Porrero, C. 2
  7. Dominguez, L. 2
  8. Torres, C. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  2. 2 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

Revista:
Microbial Drug Resistance

ISSN: 1076-6294

Año de publicación: 2003

Volumen: 9

Número: 2

Páginas: 201-209

Tipo: Artículo

PMID: 12820806 SCOPUS: 2-s2.0-0037937290 WoS: WOS:000183480000012 GOOGLE SCHOLAR

Otras publicaciones en: Microbial Drug Resistance

Resumen

A total of 1439 Escherichia coli isolates from sick animals were received from the Spanish Network of Veterinary Antimicrobial Resistance Surveillance (VAV) from 1997 to 2001. Antimicrobial susceptibility tests were performed and diminished susceptibility to cefotaxime and ceftazidime was identified in 2.5% and 2.8% of the isolates, respectively. β-lactamase characterization was carried out in the group of 20 E. coli isolates with both characteristics. The MIC ranges of different β-lactams showed by these 20 isolates were as follows (in μg/ml): ampicillin (64->256), amoxicillin-clavulanic acid (4-64), ticarcillin (8->128), cefazolin (32->256), cefoxitin (4->128), cefotaxime (1-64), ceftazidime (2->64), ceftriaxone (0.5-64), imipenem (≤0.06-0.25), and aztreonam (2->32). TEM, SHV, CMY, and FOX β-lactamase genes were analyzed by PCR and sequencing. The β-lactamase genes detected were the following ones (number of isolates): blaTEM1b (3), blaTEM-1a (1), blaTEM-30f (2), blaTEM+1b + blaCMY-2 (2), and blaSHV-12 (1). Sequences of the promoter and/or attenuator region of the chromosomal ampC gene were studied in all the 20 isolates. Mutations at position -42 or -32 were detected in 16 isolates and these mutations were associated with the presence of a TEM type β-lactamase in 6 isolates. Besides, a high variety of plasmidic β-lactamases was detected including TEM-30 and CMY-2. To our knowledge, this is the first time that TEM-30 β-lactamase has been detected in E. coli isolates of animal origin.