Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 5 5-6 2017 02 02 1 12 EN Laila Goudarzi Department of Microbiology, Faculty of Sciences, Alzahra University, Tehran, Iran. AND Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran. Rouha Kasra Kermanshahi Department of Microbiology, Faculty of Sciences, Alzahra University, Tehran, Iran. Zahra Mousavinezhad Department of Microbiology, Faculty of Sciences, Alzahra University, Tehran, Iran. Mohammad Mehdi Soltan Dallal Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran. AND Division of Food Microbiology, Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. 2017 02 01 2017 02 01 Background:   Proteus spp. belongs to the family of Enterobacteriaceae. These bacteria are Gram-negative and motile microorganisms and known as the third most common causes of urinary tract infections. The aim of the current study was to investigate the effects of some secondary metabolites from probiotic strains of Lactobacillus spp. on swarming and growth of Proteus mirabilis and P. vulgaris.  Methods:   After determination of optimal conditions for the growth and production of antimicrobials, bacteriocins and biosurfactants were partially purified from Lactobacillus culture supernatants. Then, effects of the purified compounds on growth and swarming migration of Proteus spp. were examined in the presence of various concentrations of semi-purified compounds.  Results:  Results showed that the partially purified bacteriocins inhibited Proteus spp. swarming distance and had a significant reduction on the bacterial growth curves. Biosurfactants in a solvent form did not have any considerable effects on factors produced by Proteus spp.  Conclusion:  According to the results, the secondary metabolites, especially bacteriocins or bacteriocin-like substances derived from Lactobacillus strains, can inhibit or reduce growth and swarming migration of Proteus spp. which are considered as the bacteria major virulence factors. https://jmb.tums.ac.ir/index.php/jmb/article/view/268 https://jmb.tums.ac.ir/index.php/jmb/article/download/268/195

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 5 5-6 2016 12 15 46 59 EN Moslem Papizadeh Department of Microbiology, Pasteur Institute of Iran (IPI), Tehran, Iran. Hossein Nahrevanian Department of Parasitology, Pasteur Institute of Iran (IPI), Tehran, Iran. Mahdi Rohani Department of Microbiology, Pasteur Institute of Iran (IPI), Tehran, Iran. Seyed Nezamedin Hosseini Research and Production Complex, Pasteur Institute of Iran (IPI), Tehran, Iran. Seyed Abbas Shojaosadati Department of Biotechnology Group, Chemical Engineering Department, Tarbiat-Modares University, Tehran, Iran. 2017 08 12 2017 08 12       Probiotics, living microorganisms which when used in adequate amounts, have health benefits on the host, have attracted a considerable deal of interest in the biotechnology market. Various prokaryotic and eukaryotic microbes have been studied for probiotic purposes in human and animals. Lactobacillus and Bifidobacterium are the main probiotic genera; however, there are reports on the probiotic potential of strains belonging to Bacillus, Lactococcus, Pediococcus and also some yeast species. Lactobacillus species are regarded as the most investigated beneficial microbes for human and either animal probiotic development due to: a) anti-inflammatory effects, b) anti-allergic features, c) secretion of antimicrobial compounds, d) develops in aerobic and anaerobic conditions, and e) many Lactobacilli have been Generally Recognized As Safe (GRAS) by the Food and Drug Administration (FDA). Among Lactobacilli, Lactobacillus rhamnosus Gorbach-Goldin (GG) is known among the most in-detail studied strains and is regarded as a top well-researched and commercialized probiotic strain in the industrial biotechnology. Strain GG is a commercially significant probiotic which was originally isolated from the healthy human gastrointestinal tract in 1983. The documents studied this strain were reviewed here and it is shown that such successful strains in the probiotic market have been extensively studied from the probiotic traits and safety point of views and a minor part of the documents concerned the bioprocessing issues. Also, we showed that the beneficial and negative effects of this strain has been investigated in various clinical trial systems when it became commercialized. Various aspects of this strain are here reviewed, comparatively.  https://jmb.tums.ac.ir/index.php/jmb/article/view/318 https://jmb.tums.ac.ir/index.php/jmb/article/download/318/227

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 5 5-6 2016 12 15 13 20 EN Abdol-Rasoul Sobhani Department of Pharmacology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran. Mahin Mallaei Vice-chancellor of Research and Technology, Guilan University of Medical Sciences, Rasht, Iran. Samaneh Kazemi Vice-chancellor of Research and Technology, Guilan University of Medical Sciences, Rasht, Iran. 2017 02 15 2017 02 15 Background: The increasing bloodstream infection mainly in developing countries is one of the most important health care systems concern. And, the choice of antimicrobial treatment for septicemia is often empirical and based on the knowledge of local antimicrobial activity patterns of the most common bacteria causing such bloodstream infections. This study was carried to identify the microbial profile in the blood culture isolates and their antibiotic susceptibility patterns. Methods: This retrospective cross sectional study was done at Razi Hospital, Rasht, Iran over a period of thirteen months from August 2012 to September 2013. Bacteria were identified by various biochemical tests and antimicrobial susceptibility testing of the isolates was performed by KirbyBauer disc diffusion method. Results: Out of 953 identified isolates, Gram-negative isolates 482 (50.58%) were followed by Grampositive isolates 471 (49.42%). Among Gram-positive organisms Staphylococcus epidermidis was the highest with 255 (54%) records and in Gram-negative bacteria Pseudomonas spp. was highest with 241 (50%) records. There were 467 (49.0%) positive blood culture reports for males and 487 (51.0%) for females. Pseudomonas spp. (134 reports) and S. epidermidis (162 reports) were the most common pathogens in male and woman, respectively. In 15-44 years old age group, Pseudomonas spp. and in 45-75< years age group, S. epidermidis were identified as the most common. S. epidermidis isolates were more resistant to Erythromycin, Oxacillin and Doxycycline. Pseudomonas spp. isolates had more resistant to imipeneme, amikacin and cefalexin. Conclusion:It can be concluded that bacterial resistance to antibiotics which used against bloodstream infections can make complication in treatment of infection cause by these pathogens. https://jmb.tums.ac.ir/index.php/jmb/article/view/279 https://jmb.tums.ac.ir/index.php/jmb/article/download/279/206

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 5 5-6 2016 12 15 21 28 EN Maryam Dehghani Department of Microbiology, Karaj Branch, Islamic Azad University, Karaj, Iran. Azam Haddadi Department of Microbiology, Karaj Branch, Islamic Azad University, Karaj, Iran. Mahmoud Shavandi Microbiology and Biotechnology Research Group, Research Institute of Petroleum Industry, Tehran, Iran. 2017 03 01 2017 03 01 Background:   AmpC β-lactamases are important cephalosporinases chromosomally encoded in many of Enterobacteriaceae and a few other organisms where they mediate resistance to cephalothin, cefazolin, cefoxitin and penicillins. The six different families of plasmid-mediated AmpC β-lactamases have been described, but no phenotypic test can discriminate among them. AmpC multiplex PCR has been successfully used to discriminate plasmid-mediated ampC specific families in organisms such as Klebsiella pneumonia and Escherichia coli. The aim of this study was to indicate the prevalence of AmpC β-lactamase genes by specifically designed primers through PCR test.  Methods:   243 total clinical urine samples were collected, and 227 isolates were identified as Escherichia coli based on standard biochemical tests. Subsequently, the isolates were screened by disc diffusion and combined disc test for β-lactamase production. Resistant isolates were evaluated by PCR for ampC family determination. Results:  Antibiotic resistance pattern were observed as follows: cefepime (30%), ceftazidime (36%), ceftriaxone (42%), cefotaxime (47%). The ratio of isolates was detected as ESBLs and AmpC producers were 34% and 5.2%, respectively. PCR performed on 12 selected isolates via phenotypic tests and the results revealed that among 12 isolates, 11 contained blaCMY-42.    Conclusion:  Unfortunately, antibiotic resistance has become an increasingly critical problem in many countries like Iran and occurrence of isolates co-expressing AmpC-β-lactamases and ESBLs can create serious problems in the future. As antibiotic options in the treatment of AmpC β-lactamases and ESBLs producing organisms are extremely limited, molecular screening by laboratories is suggested to reduce the risk of therapeutic defeat. https://jmb.tums.ac.ir/index.php/jmb/article/view/281 https://jmb.tums.ac.ir/index.php/jmb/article/download/281/207

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 5 5-6 2017 02 02 29 38 EN Zahra Tahanasab Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Sina Mobasherizadeh Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Mehdi Moghadampour Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Aliakbar Rezaei Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Nafiseh Maleki Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Jamshid Faghri Department of Microbiology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. 2017 02 02 2017 02 02 Background:   This study was to evaluate the prevalence of CTX-Mand TEM type ESBLs-producing K. pneumoniae and determination of MDR, XDR, and PDR phenotypes of these isolates as well as find out the genetic relationship and molecular typing of these isolates using phenotypic and genotypic methods. Methods:   Non-repetitive 96 K. pneumonia isolates were isolated from hospitalized patients in Al-Zahra hospital of Isfahan, Iran. The antibiotic susceptibility test was assessed for 20 antibiotics using Kirby-Bauer disk diffusion method. The frequency of ESBL-producing isolates was determined by phenotypic confirmatory test. All ESBLs-producing isolates were assessed for blaTEM and blaCTX-M genes using PCR method. Molecular typing was performed by enterobacterial repetitive intergenic consensus sequence-based PCR (ERIC-PCR). Results:  Among 96 isolates, 58 isolates (60.4%) were ESBL-producers. In this study, 85.7% and 30.3% of ESBL-producing isolates showed MDR and XDR phenotypes, respectively. No PDR isolate was found. PCR amplification on ESBL-producing isolates showed that 47 (81%) isolates were carried blaTEM gene, while blaCTX-M was detected in all isolates (100%). ERIC-PCR typing was characterized the high genetic similarity among ESBL-producing K. pneumonia isolates and revealed 32 band pattern for the isolates.   Conclusion:  This study showed high prevalence of important ESBL genes (blaCTX-M and blaTEM genes) among the K. pneumoniae isolated from in-patients. Constant following of ESBLs, also identification of their types, in bacteria isolated from hospitalized patients has an important clinical impact. It can provide valuable information for the choice of appropriate antibacterial therapy and decrease of antibiotic resistance. https://jmb.tums.ac.ir/index.php/jmb/article/view/276 https://jmb.tums.ac.ir/index.php/jmb/article/download/276/203

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 5 5-6 2017 02 02 39 45 EN Maryam Moghadasi Department of Microbiology, Boroujerd Branch, Islamic Azad University, Boroujerd, Iran. Mohsen Mirzaee Department of Medical Laboratory Sciences, Boroujerd Branch, Islamic Azad University, Boroujerd, Iran. Mohammad Reza Mehrabi Department of Medical Laboratory Sciences, Boroujerd Branch, Islamic Azad University, Boroujerd, Iran. 2017 02 02 2017 02 02 Background:   Klebsiella pneumoniae is among the most common and significant agents of community and hospital-acquired infections. Plasmid mediated quinolone resistance (PMQR) was increasingly identified in Enterobacteriaceae family worldwide. Plasmid-mediated quinolone resistance (PMQR) was first reported in 1998 from a Klebsiella pneumoniae isolate in the USA. Till date, five Qnr proteins have been identified; QnrA, QnrB, QnrC, QnrD and QnrS. Quinolone are broad spectrum antibiotics the resistant to which has increasingly been reported among many bacterial species including Klebsiella. The aim of this study was the antibiotic resistance profile was determined based on resistance and molecular characterization of qnrB and qnrC genes in Klebsiella pneumoniae clinical isolated. Methods:   In this cross sectional study, 94 samples of K. pneumoniae were collected. Isolates were screened for quinolone antibiotics resistance using disk diffusion method according to clinical and laboratory standards institute (CLSI) guidelines. Isolates with resistance to at least one of the quinolone antibiotics, examined for presence of the qnrB and qnrC genes. Results:  Based on the obtained results by the Agar disk diffusion test, 29.78%, 27.65%, 28.72% and 27.65% of the isolates were resistant to nalidixic acid, ciprofloxacin, norfloxacin and ofloxacin, respectively. Of these 46.66% carried qnrB, 3.33% carried qnrC genes.   Conclusion:   The identification of qnrB gene among quinolone-resistant K. pneumoniae isolates shows that the emergence of PMQR in this region requires serious preventive measures. https://jmb.tums.ac.ir/index.php/jmb/article/view/277 https://jmb.tums.ac.ir/index.php/jmb/article/download/277/204