Detection of genes coding for extended-spectrum SHV beta-lactamases in clinical isolates by a molecular genetic method, and comparison with the E test

Eur J Clin Microbiol Infect Dis. 1996 May;15(5):398-402. doi: 10.1007/BF01690097.


A highly sensitive and specific method, termed PCR/NheI, for the detection of genes coding for SHV extended-spectrum beta-lactamases (ESBL) in clinical isolates is presented. It is based on polymerase chain reaction (PCR) amplification of the blaSHV genes, followed by restriction with NheI. Due to the glycine (positive 238) (SHV-non-ESBL)-->serine (position 238) (SHV-ESBL) mutation, only PCR fragments from the genes coding for SHV-ESBLs were cleaved. A commercially available test for ESBLs, the E test ESBL, identified 52% of our 29 clinical isolates carrying blaSHV-ESBL genes as ESBL producers.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Base Sequence
  • Escherichia coli / enzymology*
  • Escherichia coli / genetics
  • Genetic Techniques
  • Humans
  • Klebsiella pneumoniae / enzymology*
  • Klebsiella pneumoniae / genetics
  • Molecular Sequence Data
  • Polymerase Chain Reaction* / methods
  • Sensitivity and Specificity
  • beta-Lactamases / metabolism*


  • beta-Lactamases