TY - JOUR
T1 - Antibiotic susceptibility of bacterial strains isolated from patients with various infections
AU - Lee, S. H.
AU - Jeong, S. H.
PY - 2002/1/1
Y1 - 2002/1/1
N2 - Aims: Isolates from various samples obtained during 1998 and 1999 were identified and their susceptibility to third-generation cephalosporins, monobactams and/or cephamycins studied along with any production of ESBLs. Methods and Results: Of these samples, bacteria most frequently isolated by the conventional techniques and Vitek GNI card were Escherichia coli (37%), Klebsiella pneumoniae (27%) and Enterobacter cloacae (16%). Using disk diffusion and double-disk synergy tests, we found that 71% strains produced ESBLs and 18% strains produced ESBLs and cephamycinases. Banding patterns of PCR amplification with the designed primers showed that 57% strains were capable of harbouring blaSHV genes. The blaTEM, blaCMY and blaAmpC genes were harboured by 55%, 31% and 12% strains, respectively. Forty-five percent of strains contained more than two types of β-lactamase genes. In particular, one strain contained blaTEM, blaSHV, blaCMY and blaAmpC genes. Conclusions: The percentage of ESBL-producing strains was high. The most prevalent β-lactamase gene was blaSHV gene. The blaCMY genes have been prevalent in cephamycin-resistant strains. The multidrug-resistant strains resistant to third-generation cephalosporins and cephamycins were detected in high percentage. Significance and Impact of the Study: Resistance mechanisms to β-lactams, comprising mostly extended-spectrum β-lactamase (ESBL) production, lead to the resistance against even recently developed β-lactams in enterobacteria, which is now a serious threat to antibiotic therapy. The high prevalence of blaCMY genes and multidrug-resistant genes may also cause therapeutic failure and lack of eradiation of these strains by third-generation cephalosporins or cephamycins.
AB - Aims: Isolates from various samples obtained during 1998 and 1999 were identified and their susceptibility to third-generation cephalosporins, monobactams and/or cephamycins studied along with any production of ESBLs. Methods and Results: Of these samples, bacteria most frequently isolated by the conventional techniques and Vitek GNI card were Escherichia coli (37%), Klebsiella pneumoniae (27%) and Enterobacter cloacae (16%). Using disk diffusion and double-disk synergy tests, we found that 71% strains produced ESBLs and 18% strains produced ESBLs and cephamycinases. Banding patterns of PCR amplification with the designed primers showed that 57% strains were capable of harbouring blaSHV genes. The blaTEM, blaCMY and blaAmpC genes were harboured by 55%, 31% and 12% strains, respectively. Forty-five percent of strains contained more than two types of β-lactamase genes. In particular, one strain contained blaTEM, blaSHV, blaCMY and blaAmpC genes. Conclusions: The percentage of ESBL-producing strains was high. The most prevalent β-lactamase gene was blaSHV gene. The blaCMY genes have been prevalent in cephamycin-resistant strains. The multidrug-resistant strains resistant to third-generation cephalosporins and cephamycins were detected in high percentage. Significance and Impact of the Study: Resistance mechanisms to β-lactams, comprising mostly extended-spectrum β-lactamase (ESBL) production, lead to the resistance against even recently developed β-lactams in enterobacteria, which is now a serious threat to antibiotic therapy. The high prevalence of blaCMY genes and multidrug-resistant genes may also cause therapeutic failure and lack of eradiation of these strains by third-generation cephalosporins or cephamycins.
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U2 - 10.1046/j.1472-765x.2002.01088.x
DO - 10.1046/j.1472-765x.2002.01088.x
M3 - Article
C2 - 11874545
AN - SCOPUS:0036122391
SN - 0266-8254
VL - 34
SP - 215
EP - 221
JO - Letters in Applied Microbiology
JF - Letters in Applied Microbiology
IS - 3
ER -