Korean J Infect Dis.  1997 Jul;29(4):271-276.

Prevalence of TEM- and SHV-type Beta-lactamase gene in Escherichia coli and Klebsiella pneumoniae in Korea

• Sohn SH
• Lee DJ
• Kim CI
• Kim JM
• Pai HJ

Abstract

BACKGROUND: Resistance to beta-lactams in E. coli is mostly via acquisition of plasmid-mediated beta-lactamase gene. Among the plasmid-mediated beta-lactamases, TEM-1 beta-lactamase is by far the most prevalent among ampicillin-resistant E. coli. The prevalence of TEM-1 or TEM-2 ranged from 61% to 98% across the surveys. Klebsiella species generally have class A chromosomal beta-lactamases, which differ greatly from the class C types. Most K. pneumoniae isolates have chromosomally mediated SHV-1 beta-lactamase in most surveys. There has been only one report of prevalence and types of beta-lactamases in E. coli and K. pneumoniae in Korea. We performed this study to determine the prevalence and types of beta-lactamases in E. coli and K. pneumoniae isolated in Korea.
METHODS
Ampicillin resistance was determined by disk diffusion test (E. coli) and agar dilution method (K. pneumoniae). Fifty five isolates of E. coli and 92 isolates of K. pneumoniae which were derived from patients in 2 university hospitals in Korea during 1996 were tested by TEM- and SHV-specific PCR.
RESULTS
The ampicillin resistance rate in E. coli and K. pneumoniae was 82% and 94.6%, respectively. TEM-type beta-lactamase gene was found in 53% of E. coli isolates. 93.5% of K. pneumoniae isolates was found to have SHV-type beta- lactamase gene.
CONCLUSION
In Korea TEM-type beta-lactamase gene was most prevalent in E. coli, but its prevalence rate was relatively low compared with those in other country. For K. pneumoniae, the isolates with SHV type beta-lactamase gene were predominant.

Keyword

Beta-lactamase; Ampicillin resistance; Escherichia coli; Klebsiella pneumoniae; Korea

MeSH Terms

Agar
Ampicillin Resistance
beta-Lactamases*
beta-Lactams
Diffusion
Escherichia coli*
Escherichia*
Hospitals, University
Humans
Klebsiella pneumoniae*
Klebsiella*
Korea*
Penicillinase
Pneumonia
Polymerase Chain Reaction
Prevalence*
Agar
Penicillinase
beta-Lactamases
beta-Lactams