Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 37 41 EN Tanaz Zabihi Department of Microbiology, School of Biology, Falavarjan Branch, Islamic Azad University, Isfahan, Iran. Vajihe Karbasizade Department of Microbiology, Falavarjan Branch, Islamic Azad University, Isfahan, Iran. Ali Mohammad Ahadi Department of Genetics, University of Shahrekord, Shahrekord, Iran. 2017 01 11 2017 01 11 Background: These days, the antibiotic resistance of Pseudomonas aeruginosa isolates to imipenem has significantly increased. Therefore the study of resistance to imipenem in this organism to imipenem in determining the appropriate treatment is crucial and necessary. The goal of this study is to compare three phenotypic methods of E-test, disk diffusion and micro broth dilution in the study of resistance to imipenem in clinical isolates of P. aeruginosa. Methods: Within a 6-month interval, 120 clinical specimens were collected and evaluated. All isolates were identified as P. aeruginosa by standard biochemical tests and amplification of 16S rRNA gene. Three phenotypic methods of E-test, disk diffusion, and micro broth dilution were used to determine imipenem resistance in P. aeruginosa isolates. Results: Of the 96 P. aeruginosa isolates studied for their resistance to imipenem by the use of E-test, disk diffusion and micro broth dilution methods, 38.5% of the strains in micro broth dilution method and 33.3% in the two methods of E-test and disk diffusion were resistant to imipenem. The rate of sensitivity and specificity of disk diffusion and E-test methods were 100%, 90.1%, and they were 100% and 83.1% for micro broth dilution, respectively. Conclusion: With regard to the results obtained from the comparison of the three methods 100% agreement were observed among the antimicrobial susceptibility results obtained by the E-test and disk diffusion methods (P ≥ 0.05). Therefore, the use of disk diffusion method can be an appropriate replacement for E-test method with regard to its being easy and cost-effective. https://jmb.tums.ac.ir/index.php/jmb/article/view/247 https://jmb.tums.ac.ir/index.php/jmb/article/download/247/181

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 1 6 EN Baharak Akhtardanesh Department of Clinical Sciences, School of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran. Reza Ghanbarpour Department of Pathobiology, School of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran. Elmira Yazdani Department of Clinical Sciences, School of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran. 2017 01 11 2017 01 11 Background: This study was set to detect extended-spectrum beta-lactamases (ESBLs) producing E. coli isolates and the genes underlying their resistance in relation to phylogenetic background from fecal samples of healthy owned cats.  Methods: A total of 50 E. coli isolates were confirmed by standard bacteriological tests. The phylogenetic analyses of the isolates were carried out by combinations of three genetic markers chuA, yjaA and DNA fragment TspE4.C2 by a triplex PCR method. The ESBL (blaCTXM, blaTEM, blaSHV, blaOXA) encoding genes were detected. To identify ESBL producing phenotypes, all selected isolates were screened with a double disk synergy test including cefotaxime, cefotaxime with clavulanic acid, ceftazidime and ceftazidime with clavulanic acid.  Results: Results showed that E. coli isolates fell into four phylogenetic groups (A, D, B1 and B2) with prevalence of 78%, 4%, 8%, 10% and five phylogenetic subgroups including A0 (74 %), A1 (4 %), B1 (8 %), B2–2 (6 %), B2–3 (4 %) and D1 (4 %), respectively. Among all E. coli isolates, 4% were positive for blaSHV, blaCTX-M-15 and blaOXA-1 genes which distributed in B2-2, B2-3, A0 subgroups, respectively. According to antibiotic susceptibility test, 20 isolates were resistant which belonged to D (D1 phylogenetic subgroup) and A (A0 phylogenetic subgroup) groups.  Conclusion: The results showed that healthy cats could be considered as potential source for the dissemination of ESBL-encoding genes. Further investigations in companion animals and their owners are needed to clarify the importance of spreading of these zoonotic strains. https://jmb.tums.ac.ir/index.php/jmb/article/view/241 https://jmb.tums.ac.ir/index.php/jmb/article/download/241/175

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 7 12 EN Behzad Ghasemi Faculty of Veterinary Medicine, University of Zabol, Zabol, Iran. Hamid Beyzaei Department of Chemistry, Faculty of Sciences, University of Zabol, Zabol, Iran. Seyed Hadi Hashemi Faculty of Veterinary Medicine, University of Zabol, Zabol, Iran. Hamidreza Majidiani Department of Medical Parasitology and Entomology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran. 2017 01 11 2017 01 11 Background: Escherichia coli is one of the important pathogens in human with global importance. Because of the necessity for identification and the use of novel antibacterial compounds against E. coli, in this present study we focused on the antibacterial effects of synthesized thiazole, imidazole and tetrahydropyridine derivatives on E. coli.  Methods: For evaluation of antibacterial effect, the disk diffusion method was applied to measure the growth inhibition zone diameter and broth micro-dilution was performed to determine the minimum inhibitory concentration (MIC).  Results: Assessing the antibacterial effect showed that only 6d derivative of thiazole had inhibitory effect on E. coli and the other thiazole, imidazole and tetrahydropyridine derivatives lacked any inhibitory result on this organism. The inhibitory effect of 6d derivative of thiazole was MIC=125 and growth inhibition zone diameter of 16±0.1.  Discussion: The antibacterial effect of thiazole, imidazole and tetrahydropyridine derivatives differs from each other and chemical linkages such as oxygen to thiazole ring in 6d derivative, could have reinforced this effect. The next step is determination of the toxicity and therapeutic effects in the laboratory animals. https://jmb.tums.ac.ir/index.php/jmb/article/view/242 https://jmb.tums.ac.ir/index.php/jmb/article/download/242/176

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 13 18 EN Mohammad Mehdi Soltan Dallal Department of Pathobiology, Food Microbiology Division, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. AND Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran. Enayatollah Kalantar Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran. AND Dietary Supplements and Probiotic Research Center, Alborz University of Medical Sciences, Karaj, Iran. Laya Kafami Khorasani Department of Microbiology and Immunology, Alborz University of Medical Sciences, Karaj, Iran. Mohammad Hassan Hoshdar Tehrani Medicinal Chemistry Dept. Shahid Beheshti University of Medical Sciences, Tehran, Iran. Monireh Zeinolabedini Zamani Department of Pathobiology, Food Microbiology Division, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. 2017 01 11 2017 01 11 Background: Staphylococcus aureus strains exhibiting multiple antibiotic resistances are isolated from most communities and hospital infections. Treatment of patients with these infections has been difficult. The aim of this study was to detect and extract, the egg yolk immunoglobulin Y as a potential source of anti- S. aureus antibody.  Methods: Specific IgY was produced by immunizing hens with formalin-killed S. aureus. The specificity of serum`s antibody was confirmed by ELISA method. The antibodies were extracted from egg yolk by polyethylene glycol (PEG) precipitation. Proteins were analysed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE).  Results: Chicken egg yolk antibodies (IgY) were raised against S. aureus in the serum after injections. Up to 104 dilution specific antibodies were determined in serum.  Conclusion: The results of the ELISA indicates the specificity of the immunoglobulin Y to the target antigen. In order to find a viable alternative to antibiotic treatments, more research must be done on the ability of these antibodies to inhibit the growth of S. aureus. https://jmb.tums.ac.ir/index.php/jmb/article/view/243 https://jmb.tums.ac.ir/index.php/jmb/article/download/243/177

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 19 23 EN Mohammad Khalili Department of Pathobiology, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran. AND Research Center of Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran. 2017 01 11 2017 01 11 Background: Q fever is a zoonotic disease caused by inhalation of the bacterium Coxiella burnetii. Ruminant livestock are common reservoirs for C. burnetii, and bacteria present in aerosols derived from the waste of infected animals can infect humans. C. burnetii is thought to infect humans primarily via airborne transmission.  Methods: 64 environmental swab samples were collected from 24 sheep and goat farms in Southeast Kerman province (Iran).  Results: In this study touchdown nested trans- PCR were used for detection of C. burnetii in environmental samples. We detected C. burnetii DNA in inhalable dust samples collected at 5 farms.  Conclusion: This first report in Iran highlighted presence of C. burnetii in dust originated from goat and sheep farms and that role in human infections with disseminating by wind. https://jmb.tums.ac.ir/index.php/jmb/article/view/244 https://jmb.tums.ac.ir/index.php/jmb/article/download/244/178

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 24 30 EN Hashem Fakhre Yaseri Gastroenterology, Research Center for Gastroenterology and Liver Diseases, Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran. AND Department of Internal Medicine, Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran. Mehdi Shakaraby Immunology Research Center, Iran University of Medical Sciences, Tehran, Iran. Hamid Reza Baradaran Department of Epidemiology, Iran University of Medical Sciences, Tehran, Iran. Seyed Kamran Soltani Arabshhi Department of Internal Medicine, Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran. 2017 01 11 2017 01 11 Background: Helicobacter pylori strains have two classical virulence genes, the cytotoxin-associated A (cagA) gene and the vacuolating cytotoxin A (vacA) gene, which are located in the cag pathogenicity island (cagPAI). Serum immunoglobulin G (IgG) antibodies to H. pylori, especially, the CagA antigen may be a reliable marker for selection of dyspeptic patients for upper endoscopy.  Methods: Serum sample of 129 dyspeptic patients with positive H. pylori, were tested for serum IgG Anti-CagA antibody by ELISA. The presence of the cagA and vacA genotypes were determined using polymerase chain reaction (PCR) on biopsy samples taken via endoscopy.  Results: Positive serum IgG anti-CagA antibodies in patients with cagA+/vacA+ and cagA+/vacA-genotypes were 22/23 (95.6%) and 18/19 (94.7%), respectively. In addition, serum IgG anti-CagA antibodies in patients with cagA-/vacA+ and cagA-/vacA- genotypes were 22/47 (46.8%) and 33/40 (82.5%), respectively.  Conclusion: It can be concluded that the serum IgG anti-CagA antibody alone could select patients with dyspepsia following upper endoscopy. The assessment of vacuolating cytotoxin activity of H. Pylori is, therefore, not required, even when vacA gene is positive. This hypothesis needs to be studied in a large number of patients with dyspepsia. https://jmb.tums.ac.ir/index.php/jmb/article/view/245 https://jmb.tums.ac.ir/index.php/jmb/article/download/245/179

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 31 36 EN Vajihe Karbasizade Department of Microbiology, Falavarjan Branch, Islamic Azad University, Isfahan, Iran. Leila Heidari Microbiology Laboratory, Shariati Hospital, Isfahan, Iran. Reyhaneh Jafari Department of Microbiology, Falavarjan Branch, Islamic Azad University, Isfahan, Iran. 2017 01 11 2017 01 11 Background: Acinetobacter baumannii as one of the causes of nosocomial infections has become resistant to almost all antimicrobial agents. The emergence of resistance to carbapenems, one of the last drugs on the shelf, is the major concern about A. baumannii antimicrobial resistance. Resistance to carbapenems is mediated by production of class B and D carbapenemases. The aim of this study was to detect the resistance genes including blaOXA-23, 24, 51, and 58 in A. baumannii isolates from nosocomial infections in Isfahan hospitals.  Methods: A total number of 456 clinical specimens were collected from nosocomial infections and evaluated in order to isolate A. baumannii strains. After identification of the isolates, the antibiotic sensitivity to carbapenems was assessed using disk diffusion method. The resistance genes of bla OXA-23, 24, 51, and 58 were detected by multiplex PCR method.  Results: Fifty A. baumannii isolates were isolated from clinical specimens. Fifty two percent of the isolates showed phenotypic resistance to the carbapenems (imipenem and meropenem).  According to PCR results, 88% of resistant isolates had ≥1 blaOXA gene. The frequency of resistant isolates bearing blaOXA-23, blaOXA-24 and blaOXA-58 were 77%, 38% and 15% respectively. Conclusion: This study showed the high frequency of carbapenem resistance genes among A. baumannii isolates. Therefore, adopting an appropriate strategy to confine the spreading of these strains and also implementing new treatment regimens are necessary. https://jmb.tums.ac.ir/index.php/jmb/article/view/246 https://jmb.tums.ac.ir/index.php/jmb/article/download/246/180

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 4 5-6 2015 12 15 42 46 EN 2015 10 12 2015 10 12 Background: Methicillin-Resistant Staphylococcus aureus (MRSA) is the one of most commonly isolated organisms from clinical samples which can cause life- threatening infections. The emergence and spread of antibiotic resistance makes the treatment of these infections more complicated. In this study, we aimed to determine  the  patterns  of  antibiotic  resistance  among  MRSA  isolates  from Tehran, Iran. Methods: From December 2012 to April 2014, 120 clinical samples were collected. MRSA was identified by cefoxitin disc diffusion. Antimicrobial susceptibility testing was performed on MRSA isolates for eight other antibiotics by disc diffusion method according to CLSI (2013) recommendations. Also, the minimum inhibitory concentration (MIC) was determined for vancomycin by MIC test strips. Results: According to disc diffusion, 60 (50%) isolates showed resistance to cefoxitin. Among these isolates, the rate of resistance to nitrofurantoin, vancomycin, teicoplanin, doxycycline, trimethoprim, erythromycin, clindamycin, and ciprofloxacin were 0%, 0%, 0%, 28.3%, 28.3%, 58.3%, 63.3%, and 70%, respectively. All isolates were susceptible to vancomycin according to disc diffusion and MIC. Conclusion: Compared to other reports from Iran, our study indicated a moderate rate  for  MRSA.  However,  the  rates  of  resistance  to  generally  prescribed antibiotics in these isolates were high. In this situation, it is recommended to monitor the antibiotic resistance in these hospitals. https://jmb.tums.ac.ir/index.php/jmb/article/view/50 https://jmb.tums.ac.ir/index.php/jmb/article/download/50/45

Tehran University of Medical Sciences Journal of Medical Bacteriology 2251-8649 2 3-4 2015 10 12 47 55 EN Zahra Ravesh-Barakzai Department of Microbiology, Quaid-i-Azam University, Islamabad, Pakistan. Jahangir Arshad-Khan Department of Microbiology, Quaid-i-Azam University, Islamabad, Pakistan. Shagufta Hussain Department of Microbiology, Pakis