Real-time polymerase chain reaction for rapid detection of genes encoding SHV extended-spectrum β-lactamases

Purpose: This study aimed to develop an improved method for the detection of bacterial SHV-type extended-spectrum beta-lactamases (ESBLs). Materials and Methods: Our method was based on real-time polymerase chain reaction (PCR) in which the amplification of the product was monitored with a fluorescent probe. This method enabled the detection of bla(SHV) genes with high degrees of sensitivity and specificity. Results: Based on ESBL phenotyping methods and bla gene DNA sequencing, we identified 240 bla genes from 662 Enterobacteriaceae isolated from clinical culture specimens. Of these 240 isolates, 26 had the bla(SHV-28) genotype and three had the bla(SHV-1) genotype. With our new real-time PCR assay, we detected 29 out of 29 bla(SHV) genes in ESBL-producing isolates. Conclusion: This method represents a powerful tool for epidemiological studies of SHV ESBLs. Furthermore, it has potential for use in diagnostic microbiology.