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Antimicrobial susceptibility patterns against Escherichia coli and prevalence of extended–spectrum β-lactamases

Author: Shrooq R. Kadhim
Journal: Mustansiriya Medical Journal مجلة المستنصرية الطبية ISSN: 20701128 22274081 Year: 2011 Volume: 10 Issue: 1 Pages: 47-50
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background There is rapid increase in bacterial resistance to antibiotics resulted in increased morbidity and mortality among patients in hospitals. Aims Monitoring of antibiotic resistance to provide data for antibiotic therapy and resistance control prescription programs. Materials and Methods Sixty seven clinical samples were collected from urine, stool, pus, wound of the patients and operating theater from some of Baghdad hospitals in 2010. Sixty two isolates of Escherichia coli were detected by bacteriological and biochemical tests, these isolates were submitted to hemolysis test and antibiotic susceptibility to 10 kinds of antibiotic disks on Mueller Hinton agar by disk diffusion method. The detection of β-lactamase production was also done and Extended-spectrum beta-lactamase (ESBL) for all the isolates. Results Hemolysis test was positive for two isolates. All the isolates of E. coli were resistant to ampicillin and cephalothin (100%) and high resistance was observed to cephalixin (95.1%), tobramycin (90.3%), doxycycline (82.2%) and nalidixic acid (70.9%). Both ciprofloxacin and nitrofurantoin was (67.7%). Low resistance was noticed to amikacin (11.2%) and trimethoprime (8.1%). β-lactamase test was positive for 57 isolates (91.9%), while three isolates (4.8%) showed positive result for extended-spectrum beta-lactamase. Conclusions Isolates of E.coli showed high resistance to ampicillin,cephalothin and cephalixin. Low resistance was revealed to amikacin and trimethoprime .Most of the isolates were positive for β-lactamase test (91.9%) and (4.8%) of the isolates were positive for extended-spectrum beta-lactamase.


Article
Antimicrobial Susceptibility Patterns Against Escherichia Coli and Prevalence of Extended–Spectrum β-Lactamases

Authors: Shrooq R. Kadhim --- Afrah M. Hassan --- Duaa S. Shoukat
Journal: Karbala Journal of Medicine مجلة كربلاء الطبية ISSN: 19905483 Year: 2011 Volume: 4 no 1 Issue: 9 Pages: 1019-1023
Publisher: Kerbala University جامعة كربلاء

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Abstract

sixty seven samples were collected from urine, stool, pus, wounds of the patients and operating theater from Baghdad Hospitals in 2010. Sixty two isolates of Escherichia coli were diagnosed by bacteriological and biochemical tests. These isolates were submitted to hemolysis test and antibiotic sensitivity to 10 kinds of antibiotic disks on Mueller Hinton agar by disk diffusion method. The detection of β-lactamase production was also done as well as extended-spectrum beta-lactamase (ESBL) for all the isolates. Hemolysis test was positive for two isolates. All the isolates of E.coli were resistant to ampicillin and cephalothin (100%) and high resistance was observed to cephalixin (95.1%), tobramycin (90.3%), doxycycline (82.2. %) and nalidixic acid (70.9%). Both ciprofloxacin and nitrofurantoin was (67.7%). Low resistance was noticed to amikacin (11.2%) and trimethoprime (8.1%). β-lactamase test was positive for 57 isolates (91.9%), while three isolates (4.8%) showed positive result for extended-spectrum β-lactamase.Conclusion: Isolates of E.coli showed high resistance to ampicillin, cephalothin and cephalixin. Low resistance was revealed to amikacin and trimethoprime. Most of the isolates were positive for β-lactamase test (91.9%) and (4.8%) of the isolates were positive for extended-spectrum beta-lactamase.

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