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Acta Microbiologica et Immunologica Hungarica

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https://www.readbyqxmd.com/read/28420242/high-prevalence-of-ndm-metallo-%C3%AE-lactamase-among-esbl-producing-escherichia-coli-%C3%A4-solates
#1
Yeliz Çetinkol, Cemal Sandalli, Mustafa Kerem Çalgin, Arzu Altunçekiç Yildirim, Esma Akyildiz, Esin Karaman, Ayşegül Çopur Çiçek
Resistance to β-lactams in Enterobacteriaceae has been increasing worldwide. This study aimed to determine the frequency of β-lactamase genes and antibiotic resistance rates of 140 extended-spectrum β-lactamase (ESBL)-producing Escherichia coli isolates obtained from urinary tract infection in Ordu Province, Turkey. Isolates were identified by classic methods and by automated system. ESBL production was confirmed by double disk synergy test and antimicrobial susceptibility was investigated by disk diffusion method...
April 19, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28263103/study-on-the-glutathione-metabolism-of-the-filamentous-fungus-aspergillus-nidulans
#2
Fruzsina Bakti, Anita Király, Erzsébet Orosz, Márton Miskei, Tamás Emri, Éva Leiter, István Pócsi
Yeast protein sequence-based homology search for glutathione (GSH) metabolic enzymes and GSH transporters demonstrated that Aspergillus nidulans has a robust GSH uptake and metabolic system with several paralogous genes. In wet laboratory experiments, two key genes of GSH metabolism, gcsA, and glrA, encoding γ-l-glutamyl-l-cysteine synthetase and glutathione reductase, respectively, were deleted. The gene gcsA was essential, and the ΔgcsA mutant required GSH supplementation at considerably higher concentration than the Saccharomyces cerevisiae gsh1 mutant (8-10 mmol l(-1) vs...
March 6, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28263102/effect-of-primycin-on-growth-arrested-cultures-and-cell-integrity-of-staphylococcus-aureus
#3
Péter Feiszt, György Schneider, Levente Emődy
Bactericidal effect against non-dividing bacteria is a very advantageous, but rare characteristic among antimicrobial agents, mostly possessed by those affecting the cell membrane. These kinds of agents can kill bacterial cells without lysis. We assessed these characteristics on primycin, a topical anti-staphylococcal agent highly effective against prevalent multiresistant strains, as it also acts on the cell membrane. In time-kill studies, primycin preserved its bactericidal activity against growth-arrested Staphylococcus aureus cultures...
March 6, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28263101/advances-in-diagnosis-and-treatment-of-helicobacter-pylori-infection
#4
Reza Ranjbar, Payam Behzadi, Shohreh Farshad
Helicobacter pylori is a Gram-negative motile bacterium causative agent of acute and chronic digestive and extra-digestive human infections. According to different reports worldwide, H. pylori symptomatic and asymptomatic infections are a global problem. The statistical investigations show a percentage of 50 for people who are involved in H. pylori acute/chronic digestive and/or extra-digestive infections around the world. This review focuses on digestive and extra-digestive diseases caused by H. pylori, the related virulence factors, diagnostic techniques including non-invasive and invasive diagnostics and treatment...
March 6, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28220708/epidemiology-and-antibiotic-sensitivity-of-staphylococcus-aureus-nasal-carriage-in-children-in-hungary
#5
Krisztina Laub, Adrienn Tóthpál, Szilvia Kardos, Orsolya Dobay
The aim of this study was to assess the Staphylococcus aureus nasal carriage rate in healthy children all over Hungary and to specify some risk factors, the antibiotic resistance patterns of the bacteria, and their genetic relatedness. In total, 878 children (aged 3-6 years) were screened at 21 day-care centers in 16 different cities in Hungary, between February 2009 and December 2011. Samples taken from both nostrils were cultured on blood agar, and suspected S. aureus isolates were identified by β-hemolysis, catalase positivity, clump test, and nucA PCR...
February 21, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28220707/first-description-of-a-rifampicin-resistant-neisseria-meningitidis-serogroup-y-strain-causing-recurrent-invasive-meningococcal-disease-in-hungary
#6
Ákos Tóth, Brigitta Berta, Tamás Tirczka, Csilla Jekkel, Anita Ábrahám, Zoltán Prohászka, Zsófia Bognár, Tímea Erdősi
A Hungarian soldier previously immunized against Neisseria meningitidis by quadrivalent polysaccharide vaccine was twice infected with meningococci within six weeks. The patient was treated with ceftriaxone during both episodes and he successfully recovered. His close contacts received rifampicin prophylaxis. An investigation was performed to characterize the genetic background of the pathogens to ascertain if the recurrent invasive meningococcal disease was caused by the same strain and to find out the reason for reinfection...
February 21, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28218004/synthesis-and-characterization-of-some-abundant-nanoparticles-their-antimicrobial-and-enzyme-inhibition-activity
#7
Shams T Khan, Ajmaluddin Malik, Rizwan Wahab, Omar H Abd-Elkader, Maqusood Ahamed, Javed Ahmad, Javed Musarrat, Maqsood A Siddiqui, Abdulaziz A Al-Khedhairy
Although the antimicrobial activity of the engineered nanoparticles (NPs) is well known, the biochemical mechanisms underlying this activity are not clearly understood. Therefore, four NPs with the highest global production, namely SiO2, TiO2, ZnO, and Ag, were synthesized and characterized. The synthesized SiO2, TiO2, ZnO, and Ag NPs exhibit an average size of 11.12, 13.4, 35, and 50 nm, respectively. The antimicrobial activity of the synthesized NPs against bacteria and fungi were also determined. NPs-mediated inhibition of two very important enzymes, namely urease and DNA polymerase, is also reported...
February 20, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28218003/virulotyping-of-shigella-spp-isolated-from-pediatric-patients-in-tehran-iran
#8
Reza Ranjbar, Masomeh Bolandian, Payam Behzadi
Shigellosis is a considerable infectious disease with high morbidity and mortality among children worldwide. In this survey the prevalence of four important virulence genes including ial, ipaH, set1A, and set1B were investigated among Shigella strains and the related gene profiles identified in the present investigation, stool specimens were collected from children who were referred to two hospitals in Tehran, Iran. The samples were collected during 3 years (2008-2010) from children who were suspected to shigellosis...
February 20, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28218002/biofilm-formation-of-achromobacter-xylosoxidans-on-contact-lens
#9
Neda Konstantinović, Ivana Ćirković, Slobodanka Đukić, Vesna Marić, Dragana D Božić
Achromobacter spp. may contaminate lenses, lens cases, and contact lens solutions and cause ocular infections. The aim of this study was to investigate the possibility of isolated strain of Achromobacter xylosoxidans to form biofilm on the surface of soft contact lenses (CL), to quantify the production of the formed biofilm, and compare it with the reference strains (Pseudomonas aeruginosa, Staphylococcus aureus, and Haemophilus influenzae). Bacterial strain isolated from one contact lens case was identified as A...
February 20, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28198195/novel-adenovirus-detected-in-kowari-dasyuroides-byrnei-with-pneumonia
#10
János Gál, Míra Mándoki, Endre Sós, Péter Kertész, Viktória Koroknai, Krisztián Bányai, Szilvia L Farkas
A male kowari (Dasyuroides byrnei) originating from a zoo facility was delivered for post mortem evaluation in Hungary. Acute lobar pneumonia with histopathologic changes resembling an adenovirus (AdV) infection was detected by light microscopic examination. The presence of an AdV was confirmed by obtaining partial sequence data from the adenoviral DNA-dependent DNA-polymerase. Although the exact taxonomic position of this novel marsupial origin virus could not be determined, pairwise identity analyses and phylogenetic calculations revealed that it is distantly related to other members in the family Adenoviridae...
February 15, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28357924/association-study-of-the-fto-gene-polymorphisms-with-the-risk-of-pulmonary-tuberculosis-in-a-sample-of-iranian-population
#11
Mohammad Naderi, Mohammad Hashemi, Nahid Dejkam, Gholamreza Bahari, Maryam Rezaei, Mohsen Taheri
AIM: The aim of the present study was to find out the impact of fat mass and obesity-associated (FTO) gene on risk of pulmonary tuberculosis (PTB) in a sample of Iranian population. METHODS: This case-control study was carried out on a total of 354 subjects including 185 PTB patients and 169 healthy subjects. Genotyping of FTO rs9939609 and rs8050136 variants was done using polymerase chain reaction-restriction fragment length polymorphism method. RESULTS: FTO rs9939609 variant showed no statistically significant difference in allele and genotype frequencies between PTB patients and controls...
March 1, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28357923/performance-of-carbanp-and-cim-tests-in-oxa-48-carbapenemase-producing-enterobacteriaceae
#12
Serap Süzük Yıldız, Banu Kaşkatepe, Havva Avcıküçük, Şükran Öztürk
This study applied two phenotypic tests, namely "Carbapenemase Nordmann-Poirel" (CarbaNP) test and "Carbapenem Inactivation Method" (CIM), against the isolates carrying the carbapenem resistance genes. The study included 83 carbapenem-resistant Enterobacteriaceae isolates producing oxacillinase-48 (OXA-48) and 30 carbapenem-sensitive Enterobacteriaceae isolates. Out of the total isolates studied, 77 isolates (92.77%) were identified as Klebsiella pneumoniae and six isolates (7.23%) were identified as Escherichia coli by Matrix Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry...
March 1, 2017: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/27981851/molecular-detection-of-aminoglycoside-modifying-enzyme-genes-in-acinetobacter-baumannii-clinical-isolates
#13
Mohsen Heidary, Alireza Salimi Chirani, Saeed Khoshnood, Gita Eslami, Seyyed Mohammad Atyabi, Habibollah Nazem, Mohammad Fazilati, Ali Hashemi, Saleh Soleimani
Acinetobacter baumannii is a major opportunistic pathogen in healthcare settings worldwide. In Iran, there are only few reports on the prevalence of aminoglycoside resistance genes among A. baumannii isolates. The aim of this study was to investigate the existence of aminoglycoside-modifying enzyme (AME) genes from A. baumannii strains collected at a university teaching hospital in Iran. One hundred A. baumannii strains were collected between 2014 and 2015 from hospitalized patients at Loghman Hakim Hospital, Tehran, Iran...
December 16, 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/27976593/antimicrobial-resistance-in-enterococcus-strains-isolated-from-healthy-domestic-dogs
#14
Fabrizio Bertelloni, Claudia Salvadori, Giulia Lotti, Domenico Cerri, Valentina Virginia Ebani
Enterococci are opportunistic bacteria that cause severe infections in animals and humans, capable to acquire, express, and transfer antimicrobial resistance. Susceptibility to 21 antimicrobial agents was tested by the disk diffusion method in 222 Enterococcus spp. strains isolated from the fecal samples of 287 healthy domestic dogs. Vancomycin and ampicillin minimum inhibitory concentrations (MICs) and high-level aminoglycoside resistance (HLAR) tests were also performed. Isolates showed resistance mainly to streptomycin (88...
December 15, 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/27936860/detection-of-acra-acrb-aac-6-ib-cr-and-qepa-genes-among-clinical-isolates-of-escherichia-coli-and-klebsiella-pneumoniae
#15
Mohsen Heidary, Aghil Bahramian, Ali Hashemi, Mehdi Goudarzi, Vahid Fallah Omrani, Gita Eslami, Hossein Goudarzi
BACKGROUND: The distribution of drug resistance among clinical isolates of Escherichia coli and Klebsiella pneumoniae has limited the therapeutic options. The aim of this study was to report the prevalence of quinolone resistance genes among E. coli and K. pneumoniae clinical strains isolated from three educational hospitals of Tehran, Iran. MATERIALS AND METHODS: A total of 100 strains of E. coli from Labbafinejad and Taleghani Hospitals and 100 strains of K. pneumoniae from Mofid Children and Taleghani Hospitals were collected between January 2013 and May 2014...
December 12, 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/27929354/differences-in-mrsa-prevalence-and-resistance-patterns-in-a-tertiary-center-before-and-after-joining-an-international-program-for-surveillance-of-antimicrobial-resistance
#16
Olivera Djuric, Snezana Jovanovic, Branka Stosovic, Tanja Tosic, Milica Jovanovic, Naomi Nartey, Jovana Todorovic, Ljiljana Markovic-Denic
Methicillin-resistant Staphylococcus aureus (MRSA) emerged as one of the most important causes of hospital-acquired bloodstream infections (BSIs), especially the multidrug resistant clones. The aim of the present study was to compare prevalence and resistance patterns of MRSA bacteremia in the major tertiary-care academic and referral center in Serbia before and after implementing an active antimicrobial resistance (AMR) surveillance. Laboratory-based before-after study was conducted during a two-year period (January 2012 to December 2013) in Clinical Centre of Serbia...
December 8, 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/27929353/enhanced-survival-but-not-amplification-of-francisella-spp-in-the-presence-of-free-living-amoebae
#17
Helen Y Buse, Frank W Schaefer, Eugene W Rice
Transmission of Francisella tularensis, the etiologic agent of tularemia, has been associated with various water sources. Survival of many waterborne pathogens within free-living amoeba (FLA) is well documented; however, the role of amoebae in the environmental persistence of F. tularensis is unclear. In this study, axenic FLA cultures of Acanthamoeba castellanii, Acanthamoeba polyphaga, and Vermamoeba vermiformis were each inoculated with virulent strains of F. tularensis (Types A and B), the attenuated live vaccine strain, and Francisella novicida...
December 8, 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28166641/hormone-acth-t3-content-of-immunophenotyped-lymphocyte-subpopulations
#18
Éva Pállinger, Gergely Attila Kiss, György Csaba
Cells of the immune system synthesize, store, and secrete polypeptide and amino acid type hormones, which also influence their functions, having receptors for different hormones. In the present experiment immunophenotyped immune cells isolated from bone marrow, thymus, and peritoneal fluid of mice were used for demonstrating the adrenocorticotropic hormone (ACTH) and triiodothyronine (T3) hormone production of differentiating immune cells. Both hormones were found in each cell type, and in each maturation state, which means that all cells are participating in the hormonal function of the immune system...
December 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28033727/fatal-cases-of-disseminated-nocardiosis-challenges-to-physicians-and-clinical-microbiologists-case-report
#19
Klára Piukovics, Viktória Bertalan, Gabriella Terhes, Ágnes Báthori, Edit Hajdú, Gyula Pokorny, László Kovács, Edit Urbán
Despite the development in the identification of Nocardia spp., common challenges exist in the laboratory diagnosis and management of nocardiosis. We report two cases of disseminated nocardiosis in a patient with hematologic disorder and in a patient with systemic lupus erythematosus, where the cooperation between various specialists was essential to set up the adequate diagnosis of disseminated nocardiosis.
December 2016: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/28033726/optimization-of-desferrioxamine-e-production-by-streptomyces-parvulus
#20
Tamás Gáll, Gábor Lehoczki, Gyöngyi Gyémánt, Tamás Emri, Zsuzsa M Szigeti, György Balla, József Balla, István Pócsi
Siderophores are produced by a number of microbes to capture iron with outstandingly high affinity, which property also generates biomedical and industrial interests. Desferrioxamine E (DFO-E) secreted by streptomycetes bacteria can be an ideal candidate for iron chelation therapy, which necessitates its cost-effective production for in vitro and animal studies. This study focused on the optimization of DFO-E production by Streptomyces parvulus CBS548.68. Different combinations of various carbon and nitrogen sources as well as the addition of 3-morpholinopropane-1-sulfonic acid (MOPS) markedly affected DFO-E yields, which were attributed, at least in part, to the higher biomass productions found in MOPS-supplemented cultures...
December 2016: Acta Microbiologica et Immunologica Hungarica
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