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Acta Microbiologica et Immunologica Hungarica

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https://www.readbyqxmd.com/read/30203691/genotypic-analysis-of-s-segment-of-crimean-congo-hemorrhagic-fever-virus-in-turkey
#1
Umut Safiye Say Coskun, Zahide Asık
The Crimean-Congo hemorrhagic fever (CCHF) virus (CCHFV) is a tick-borne virus, whose viral RNA consists of S, L, and M segments. The virus is migrating through the ticks with animals and migratory birds and the geographical distribution can be investigated based on genetic analysis. To better understand the connection between the seropositivity and the mortality rate, the key factor could be the temporal and spatial analysis of the different strains. In this study, serum samples (n = 26) were selected from CCHFV RNA-positive patients and subjected to sequence analysis of the gene regions encoding the S segments...
September 11, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30203690/the-relationship-between-structure-and-in-vitro-antistaphylococcal-effect-of-plant-derived-stilbenes
#2
Tereza Zakova, Johana Rondevaldova, Andrea Bernardos, Premysl Landa, Ladislav Kokoska
Staphylococcus aureus is a major human pathogen that is responsible for both hospital- and community-acquired infections. Stilbenes are polyphenol compounds of plant origin known to possess a variety of pharmacological properties, such as antibacterial, antiviral, and antifungal effects. This study reports the in vitro growth-inhibitory potential of eight naturally occurring stilbenes against six standard strains and two clinical isolates of S. aureus, using a broth microdilution method, and expressing the results as minimum inhibitory concentrations (MICs)...
September 11, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30203689/prevalence-of-enterotoxin-encoding-genes-among-diverse-shigella-strains-isolated-from-patients-with-diarrhea-southwest-iran
#3
Mojtaba Moosavian, Sakineh Seyed-Mohammadi, Ahmad Farajzadeh Sheikh, Saeed Khoshnood, Aram Asarehzadegan Dezfuli, Morteza Saki, Gholamreza Ghaderian, Fatemeh Shahi, Mahtab Abdi, Fariba Abbasi
Shigella spp. are a major cause of bacillary dysentery, particularly among children in developing countries such as Iran. This study aimed to investigate the presence of two important Shigella enterotoxins (ShET-1 and ShET-2), encoded by the set and sen genes, respectively, by polymerase chain reaction (PCR) assay among Shigella species isolated from children affected by shigellosis in Ahvaz, southwest of Iran. In this cross-sectional study, from June 2016 to April 2017, altogether 117 Shigella isolates were collected from fecal specimens of children aged <15 years with diarrhea in Ahvaz, southwest Iran...
September 11, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30111161/high-rate-of-carbapenem-resistant-klebsiella-pneumoniae-detected-from-hospital-equipments-in-iran
#4
Mehdi Moghadampour, Azhar Salari-Jazi, Jamshid Faghri
The objective of this study was to assess the prevalence, antibiogram, and related genes of carbapenem-resistant Klebsiella pneumoniae (CRKP) among hospital environment samples. A total of 250 samples were taken from different surfaces and medical devices of three hospitals in Isfahan, Iran. All samples were cultured and K. pneumoniae strains were identified by conventional microbiological methods and polymerase chain reaction (PCR). Antibiogram of isolates was performed by disk diffusion method and production of carbapenemases and metallo-β-lactamases (MBLs) was confirmed using modified Hodge test and E-test, respectively...
August 16, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30111160/prevalence-of-vim-and-gim-producing-acinetobacter-baumannii-from-patients-with-severe-urinary-tract-infection
#5
Smiline As Girija, Vijayashree Priyadharsini Jayaseelan, Paramasivam Arumugam
Carbapenems are administered as the final drug of choice for treating complicated nosocomial infections caused by multidrug-resistant Acinetobacter baumannii strains. It is currently a worldwide issue that metallo-β-lactamases (MBLs) as carbapenem-hydrolyzing enzymes are one of the major drug resistance mechanisms. This investigation is thus aimed to assess the prevalence and characterize the MBL-producing strains of A. baumannii both by phenotypic assays and by genotypic characterization. A total of 73 isolates of A...
August 16, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30024269/fecal-helicobacter-pylori-glmm-and-16s-rrna-genes-correlate-with-serum-tnf-%C3%AE-and-il-1%C3%AE-cytokine-fluctuations
#6
Ayat Moradipour, Afra Khosravi, Fatemeh Piri
The proinflammatory cytokines of TNF-α and IL-1β have been reported to be increased in gastric mucosal surfaces in people with Helicobacter pylori infection. Accordingly, this study was conducted to investigate the relationship between the presence of H. pylori genes and the serum oscillations of these cytokines. In this study, DNA was first extracted from the stool samples of infected individuals and used as DNA template to investigate the presence of glmM and 16S rRNA genes in PCR. The ELISA assay was employed to examine serum levels of TNF-α and IL-1β cytokines...
July 19, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30014704/hormesis-and-immunity-a-review
#7
György Csaba
The hormesis concept demonstrates that in contrast to the toxic effect of high doses of materials, irradiation, etc., low doses of them are beneficial and, in addition, help to eliminate (prevent) the deleterious effect of high doses given after it. By this effect, it is an important factor of (human) evolution protecting man from harmful impacts, similarly to the role of immunity. However, immunity is also continuously influenced by hormetic effects of environmental [chemical (pollutions), physical (background irradiations and heat), etc...
July 17, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30010394/dna-microarray-technology-and-bioinformatic-web-services
#8
Payam Behzadi, Reza Ranjbar
The pan-genomic microarray technique is used for environmental and/or clinical studies. Although microarray is an accurate and sharp diagnostic tool, the expertized bioinformaticians were able to minimize the outcome biases and maximize the flexibility and accuracy of the technique. The knowledge of bioinformatics plays a key role in association with probe designing and the utilization of correct probe sets and platforms. This technique is divided into two parts as dry lab (in silico studies) and wet lab (in vitro studies)...
July 16, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30010393/characterization-of-macrolide-resistant-non-invasive-pneumococci-in-the-pre-vaccine-era-in-serbia
#9
Suncica Popovic, Mirjana Hadnadjev, Ina Gajic, Vera Mijac, Dusan Kekic, Aleksandra Smitran, Lazar Ranin, Natasa Opavski
Numerous reports have confirmed that increased macrolide use in the treatment of respiratory tract infection has contributed to the emergence of antibiotic resistance worldwide. Studies have also shown that pneumococcal vaccine can reduce pneumococcal resistance. The aim of this study was to determine the prevalence of co-resistance to penicillin and other antibiotics in macrolide-resistant (MR) non-invasive pneumococcal isolates and to evaluate serotype distribution in resistant strains in the pre-vaccine era in Serbia...
July 16, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30010392/comparison-of-polymerase-chain-reaction-restriction-enzyme-analysis-method-and-dna-sequence-analysis-results-in-the-identification-of-non-tuberculous-mycobacteria
#10
Özgür Appak, Selçuk Türkel, Nuran Esen, Ayşe Aydan Özkütük
The typing of non-tuberculous mycobacteria (NTM) is important from a clinical and epidemiological perspective. The polymerase chain reaction-restriction enzyme analysis (PRA) method and DNA sequence analysis method were utilized to target a gene region that codes the 65-kDa heat-shock protein for typing 150 suspected NTM samples isolated from the respiratory tract. Mycobacterium abscessus, Mycobacterium xenopi, Mycobacterium fortuitum, and Mycobacterium peregrinum were most frequently found by both methods...
July 16, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30010391/asymptomatic-carriage-of-antibiotic-resistant-gram-positive-cocci-among-different-background-populations-in-east-timor-southeast-asia
#11
Raquel Santos, Miguel Grilo, Mónica Araújo, José Luís Monteiro, Manuela Oliveira
Dissemination of pathogenic multiresistant bacteria is of public health concern. Reliable data can be difficult to obtain, especially in developing countries. This work aimed to characterize the skin and oropharyngeal microbiota, as well as their antimicrobial resistance profiles, of East-Timor populations to identify potentially pathogenic Gram-positive cocci. In order to assess the prevalence of pathogenic bacteria in East-Timor, the oropharyngeal and skin microbiota of 74 individuals was characterized. Gram-positive cocci were evaluated and their antimicrobial resistance profiles were determined...
July 16, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29968490/immunity-and-longevity
#12
György Csaba
The role of immune system is to protect the organism from the not built-in program-like alterations inside and against the agents penetrating from outside (bacteria, viruses, and protozoa). These functions were developed and formed during the evolution. Considering these functions, the immune system promotes the lengthening of lifespan and helps longevity. However, some immune functions have been conveyed by men to medical tools (e.g., pharmaceuticals, antibiotics, and prevention), especially in our modern age, which help the struggle against microbes, but evolutionarily weaken the immune system...
July 3, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30043621/transmissible-silver-resistance-readily-evolves-in-high-risk-clone-isolates-of-klebsiella-pneumoniae
#13
Adrienn Hanczvikkel, Miklós Füzi, Erika Ungvári, Ákos Tóth
Silver is used extensively in both hospitals and outpatient clinics as a disinfectant coating agent on various devices. Resistance to silver was recently reported as an emerging problem in Enterobacteriaceae. Multidrug-resistant high-risk clones of Klebsiella pneumoniae are common causes of serious healthcare-associated infections worldwide posing a serious threat to patients. In this study, we investigated the capacity of both high-risk (CG14/15 and CG258) and minor clone strains of K. pneumoniae to develop resistance to silver...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30024268/the-emergence-of-bla-oxa-48-and-bla-ndm-among-esbl-producing-klebsiella-pneumoniae-in-clinical-isolates-of-a-tertiary-hospital-in-iran
#14
Mehdi Moghadampour, Aliakbar Rezaei, Jamshid Faghri
The aim of this study was to investigate the prevalence of carbapenem-resistant Klebsiella pneumoniae (CRKP) and the most common types of carbapenemases, metallo-beta-lactamases (MBLs), and extended-spectrum beta-lactamases (ESBLs) among CRKP isolates in a tertiary hospital in Isfahan, Iran. Eighty non-repetitive clinical isolates of K. pneumoniae were obtained from different clinical specimens. Antibiotic resistance pattern of isolates was determined by disk diffusion method and production of carbapenemases and MBLs was confirmed using modified Hodge test and E-test, respectively...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/30024267/mycobacteria-produce-proteins-involved-in-biofilm-formation-and-growth-affecting-processes
#15
Joana Korabliovienė, Mykolas Mauricas, Česlova Ambrozevičienė, Mindaugas Valius, Algirdas Kaupinis, Saulius Čaplinskas, Pavel Korabliov
The aim of this study was to determine the effect of mycobacterial proteins on mycobacterial biofilm formation and growth processes. We separated growth-affecting proteins (GEPs) from wild type of Mycobacterium bovis and ATCC strain of Mycobacterium avium subsp. avium. Our results showed that these mycobacteria-secreted GEPs are involved in biofilm formation, growth stimulatory, and inhibitory processes. Our findings suggest that GEP stimulated M. avium subsp. avium growth in vitro. Stimulation process was observed in mycobacteria affected with GEP extracted from M...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29651861/the-first-characterized-carbapenem-resistant-bacteroides-fragilis-strain-from-croatia-and-the-case-study-for-it
#16
Maja Bogdan, Ljilijana Perić, Katalin Ördög, Dubravka Vuković, Edit Urbán, József Sóki
An imipenem-resistant Bacteroides fragilis strain was isolated from the blood of a 72-year-old male patient with a urinary bladder tumor in Osijek, Croatia. This strain was also resistant to ampicillin, piperacillin/tazobactam, cefoxitin, clindamycin, tetracycline, and harbored cfiA, ermF, and tetQ genes where the high-level expression of the cfiA carbapenem-resistant gene was driven by an IS1187 element. Interestingly, despite the carbapenem-resistant feature of the B. fragilis from blood, the patient relatively easily recovered from the bacteremia...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29651859/effect-of-amino-acid-substitution-in-new-delhi-metallo-%C3%AE-lactamase-on-carbapenem-susceptibility
#17
Azer Özad Düzgün
The aim of this work was investigation of clinically important amino acid substitutions of NDM-1 variants. A blaNDM-1 gene was cloned into expression vector pET100/D-TOPO. The sequence of NDM-1 variants with substituted amino acids was determined by ClustalW program. A pET100/D-TOPO + blaNDM-1 was used to generate the alanine mutations at different positions, such as NDM-2 (P28A), NDM-3 (D95A), NDM-4 (M154A), NDM-5 (V88A), NDM-7 (D130A), and NDM-9 (E152A). The mutant variants were transformed into Escherichia coli DH5α...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29552898/antineoplastic-potential-of-mycotoxins
#18
István Pócsi, Gábor Király, Gáspár Bánfalvi
Fungal toxins are secondary metabolites, in which many of them were mycotoxins, affecting eukaryotic cells with a broad range of structural and functional variety contributing to the multitude of their classification. This refers to the harmful genotoxic (mutagenic, teratogenic, and carcinogenic) effects of mycotoxins on the one hand, and their cytocidic and antineoplastic properties on the other hand. This "double edged sword" effect could be utilized against the spread of tumors in older patients when the survival is much more important than the mutagenic side effects...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29512393/value-of-the-eazyplex-%C3%A2-csf-direct-assay-in-rapid-diagnosis-of-invasive-meningococcal-disease-case-report
#19
Matthias Karrasch, Sven Eisenach, Ulrich Vogel, Jan Zinke, Otto W Witte, Albrecht Günther, Bernd Romeike, Jürgen Rödel
There is a need for easy-to-use molecular assays for diagnosis of invasive meningococcal disease. Here, we report the rapid identification of Neisseria meningitidis in a cerebrospinal fluid sample from a patient with purulent meningitis using a commercially available loop-mediated isothermal amplification assay, resulting in a prompt de-escalation of the initial empiric antibiotic therapy.
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
https://www.readbyqxmd.com/read/29471694/assessing-the-microbial-communities-inhabiting-drinking-water-networks-and-nitrifying-enrichments-with-special-respect-on-nitrifying-microorganisms
#20
Zsuzsanna Nagymáté, Katalin Nemes-Barnás, Gergely Krett, Károly Márialigeti
This study provides a comprehensive microbiological survey of three drinking water networks applying different water treatment processes. Variability of microbial communities was assessed by cultivation-based [nitrifying, denitrifying most probable number (MPN) heterotrophic plate count] and sequence-aided terminal restriction fragment length polymorphism (T-RFLP) analysis. The effect of microbial community composition on nitrifying MPN values was revealed. The non-treated well water samples showed remarkable differences to their corresponding distribution systems regarding low plate count, nitrifying MPN, and the composition of microbial communities, which increased and changed, respectively, in distribution systems...
August 1, 2018: Acta Microbiologica et Immunologica Hungarica
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