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Background and Aims: High prevalence of Methicillin Resistant Staphylococcus Aureus isolates (MRSA) as well as the multi-drug resistance in this bacterium causes difficulties in the treatment of infections due to these bacteria. Hence, detection of MRSA isolates by rapid and accurate methods is necessary. PCR-ELISA is an accurate and molecular technique that is used for the detection of several pathogens. The aim of this study is the detection of MRSA using PCRELISA. Materials and Methods: Specific primers for mecA gene were designed. Then, dNTP labeled with Digoxigenin was applied for amplifying mecA gene. DIG-labeled PCR products were seeded on the well coated streptoavidin and identified by anti-DIG-peroxidase conjugate. Furthermore, Biotin-labeled DNA probe specific for mecA gene was used. Sensitivity and specificity of the method was determined. Resistance to methicillin among 70 clinical isolates was determined by the disk diffusion, agar dilution and PCR-ELISA methods. Results: MecA gene of S. aureus was amplified using gene specific primers resulted in a fragment with 310 bp length. Findings from the PCR-ELISA technic showed no cross-reactivity with Klebsiella Pneumoniae, Bacillus subtilis and Esheriashia coli as control bacteria and its sensitivity was 0.5 ng. The prevalence of MRSA clinical isolates by the disk diffusion, agar dilution and PCR-ELISA methods was 60%, 58.5% and 60%, respectively. Conclusion:The PCR-ELISA technique was known as an accurate and rapid test for the detection of infection agents using their specific gene. This technic can applied as an appropriate alternative method for time-consuming, less sensitive and expensive techniques such as Real-time PCR and differential biochemical tests which are currently used in laboratory. [ABSTRACT FROM AUTHOR]

Background and Aim: In recent years, Multidrug resistance has been increasing among Klebsiella isolates. The aim of this study was to survey existence of integrons and its relation with antibiotic resistance among clinical isolates of Klebsiella. Materials and Methods: From Jun 2015 to May 2016, 129 Klebsiella isolates collected from Karaj hospitals and laboratories. Statistical population included 80.6% female and 19.4% male. Antimicrobial susceptibility was performed using Kirby-Bauer disk diffusion and ESBLs producer were screened. Integrons were detected using PCR. Ethical Considerations: This study with research ethics code IR.IAU.K.REC.1396.16 has been approved by research ethics committee at Islamic Azad University of Karaj, Iran. Findings: The highest and lowest percentage of sensivity were found to ofloxacin (89.1%) and amoxcicillin (6.2%), respectively. 82.9% of isolates were resistant to more than two antibiotics from different classes. Among 129 isolates, 19.3% of the isolates harbour integrons. Frequencies of MDR among integron-positive isolates were 100%. Also, 71.3% and 28.7% of isolates were ESBLs positive and negative respectively. Conclusion: Results showed integron elements were prevalent among MDR isolates. Integron-associated resistance genes can be served as reservoirs of multi drug resistance within clinical isolates and presence of integron can be used as a marker to identify MDR isolates. Prevalence of ESBLs among clinical isolates of Klebsiella showed that antibiotics like ampicillin or amoxicillinclavulanic acid are not effecvtive anymore in treatment of UTIs. [ABSTRACT FROM AUTHOR]