The prevalence of extended-spectrum β-lactamase and the analysis of antibiotic susceptibility in clinical escherichia coli isolates / 中国基层医药

Objective Try to know the prevalence rate of ESBL-s produced by Eseherichia coil in our hospital from 2003 to 2007.Methods Antibiotic susceptibility were determined by K-B disc diffusion.Double-disk synergy tests performed on Mueller-Hinton agar plates was used for ESBL confirmation.Results There was 23.8% of our isolates can produce ESBLs in 2003,25.4% in 2004,31.3% in 2005,36.6% in 2006 and 44.9% in 2007,respectively.The situation of antibiotic resistance is more severe.Conclusion The antibiotic resistance should be well surveyed and the ESBLs must be routinely assayed.

Resistance to fluoroquinolones and amikacin in escherichia coli isolates / 中国基层医药

Objective To investigate the resistance to fluoroquinolones and amikacin in escherichia coti isolates. Methods ESBLs-producers were detected by CLSI phenotypic confirmatory test and susceptibilities were tested by agar dilution method. Results 33. 8% of 361 isolates were ESBLs-producers. The resistant rate of ciprofloxacin,levofloxacin, amikaxin was 93.4%, 90.9%, 13.1% in ESBLs-produeers, and that was 69.5%,68.6 %, 19.7 % in non-ESBLs-producers, respectively. Conclusion Amikaxin is active against most escherichia coli isolates; those isolates are highly resistant to fluoroquinolones, especially, in ESBLs-producers.