Microbiology
Shabnam khavandi; Mohsen Arzanlou; Roghayeh Teimourpour; Hadi Peeridogaheh
Abstract
Background & Objective: Carbapenem-resistant is Gram-negative bacteria representing a worldwide public health problem. The present study aims to survey the phenotypic and genotypic characteristics of carbapenem-resistant Escherichia coli isolates collected from hospitalized patients and outpatients ...
Read More
Background & Objective: Carbapenem-resistant is Gram-negative bacteria representing a worldwide public health problem. The present study aims to survey the phenotypic and genotypic characteristics of carbapenem-resistant Escherichia coli isolates collected from hospitalized patients and outpatients in Ardabil province, Iran.Methods: Two hundred samples were collected from the patients who had already been referred to the hospitals in Ardabil, Iran, from January to June 2017. Each patient's social and demographic data were recorded in the first step. The resistance profile of all E. coli isolates against imipenem and meropenem antibiotics were determined using the Kirby-Bauer disk diffusion method. Moreover, the broth microdilution method determined the Minimum Inhibitory Concentration (MIC) of E. coli isolates to imipenem. The Carbapenem Inactivation Method (CIM) and Carba NP test were employed for screening carbapenem-resistant strains. The frequency of carbapenem-encoding genes was determined using Polymerase Chain Reaction (PCR) method. The Enterobacterial Repetitive Intergenic Consensus (ERIC)-PCR analysis was used to evaluate the genetic relatedness of E. coli isolates.Results: Out of 200 urine samples, 66% (n = 132) of the samples were collected from women. The patients' age varied from 1 month to 93 years. Results of the disk diffusion method revealed that 33% (n=66/200) of E. coli isolates were resistant to imipenem. However, imipenem resistance was detected in 37% (n = 74/200) of the E. coli isolates using broth microdilution method. All E. coli isolates were negative in CIM and Carba NP tests. Moreover, we could not detect any carbapenemase encoding genes among E. coli isolates. The ERIC-PCR method revealed the E. coli strains were classified into 39 clusters with 80% similarity.Conclusion: It appears that E. coli is the most common cause of urinary tract infection in Ardabil province.
Microbiology
Samira Rashidian; Roghayeh Teimourpour; Zahra Meshkat
Volume 11, Issue 2 , April 2016, , Pages 112-119
Abstract
Background: Tuberculosis (TB) remains as a major cause of death around the world. Construction of a new vaccine against tuberculosis is an effective way to control it. Several vaccines against this disease have been developed. The aim of the present study was to cloning of tb10.4 gene in pcDNA3.1+ plasmid ...
Read More
Background: Tuberculosis (TB) remains as a major cause of death around the world. Construction of a new vaccine against tuberculosis is an effective way to control it. Several vaccines against this disease have been developed. The aim of the present study was to cloning of tb10.4 gene in pcDNA3.1+ plasmid and evaluation of its expression in eukaryotic cells. Methods: Firstly, tb10.4 fragment was amplified by PCR and the PCR product was digested with restriction enzymes. Next, it was cloned into pcDNA3.1+ plasmid. Following that, pcDNA3.1+/tb10.4 recombinant plasmid was transfected into eukaryotic cells. Results: 5700 bp band for pcDNA3.1+/tb10.4 recombinant plasmid and 297 bp fragment for tb10.4 were observed. Cloning and transfection were successful and designed recombinant vector was confirmed by sequencing. Conclusion: Successful cloning provides a basis for the development of new DNA vaccines against tuberculosis. In the current study, the aim was cloning of tb10.4 gene in pcDNA3.1+ plasmid and transfection into eukaryotic cells.