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  • Polish Journal Of Microbiology

 

Mini Review

Brucella – Virulence Factors, Pathogenesis and Treatment

feature of Brucella is the ability to survive and multiply within both phagocytic and non-phagocytic cells. Brucella does not produce classical virulence factors: exotoxin, cytolisins, exoenzymes, plasmids, fimbria, and drug resistant forms. Major virulence factors are: lipopolysaccharide (LPS), T4SS secretion system and BvrR/BvrS system, which allow interaction with host cell surface, formation of an early, late BCV (Brucella Containing Vacuole) and interaction with endoplasmic reticulum (ER) when

PATRYCJA GŁOWACKA, DOROTA ŻAKOWSKA, KATARZYNA NAYLOR, MARCIN NIEMCEWICZ, AGATA BIELAWSKA-DRÓZD

Polish Journal of Microbiology , ISSUE 2, 151–161

Original Paper

Safety Evaluation of Enterocin Producer Enterococcus sp. Strains Isolated from Traditional Turkish Cheeses

The purpose of this study was to determine the antimicrobial activity and occurrence of bacteriocin structural genes in Enterococcus spp. isolated from different cheeses and also investigate some of their virulence factors. Enterococcus strains were isolated from 33 different cheeses. Enterococcus faecium (6 strains) and Enterococcus faecalis (5 strains) enterocin-producing strains were identified by 16S rDNA analyses. Structural genes entA, entB, entP and entX were detected in some isolates

Mine Avci, Banu Özden Tuncer

Polish Journal of Microbiology , ISSUE 2, 223–233

Original Paper

Deletion of atoR from Streptococcus pyogenes Results in Hypervirulence in a Mouse Model of Sepsis and is LuxS Independent

Group A Streptococcus (GAS) is a Gram-positive human pathogen that causes a variety of diseases ranging from pharyngitis to life-threaten­ing streptococcal toxic shock syndrome. Recently, several global gene expression analyses have yielded extensive new information regarding the regulation of genes encoding known and putative virulence factors in GAS. A microarray analysis found that transcription of the GAS gene M5005_Spy_1343 was significantly increased in response to interaction with

Izabela Sitkiewicz, James M. Musser

Polish Journal of Microbiology , ISSUE 1, 17–24

Original Paper

The Prevalence of Exoenzyme S Gene in Multidrug-Sensitive and Multidrug-Resistant Pseudomonas aeruginosa Clinical Strains

Pseudomonas aeruginosa rods are one of the most commonly isolated microorganisms from clinical specimens, usually responsible for nosocomial infections. Antibiotic-resistant P. aeruginosa strains may present reduced expression of virulence factors. This fact may be caused by appropriate genome management to adapt to changing conditions of the hospital environment. Virulence factors genes maybe replaced by those crucial to survive, like antimicrobial resistance genes. The aim of this study was

Tomasz Bogiel, Aleksander Deptuła, Joanna Kwiecińska-Piróg, Małgorzata Prażyńska, Agnieszka Mikucka, Eugenia Gospodarek-Komkowska

Polish Journal of Microbiology , ISSUE 4, 427–431

Original Paper

Prevalence of Biofilm Formation and Wide Distribution of Virulence Associated Genes among Vibrio spp. Strains Isolated from the Monastir Lagoon, Tunisia

species were the most adhesive strains to both biotic and abiotic surfaces. Besides, V. alginolyticus isolates has the high levels of recombination of genes encoding V. cholerae and V. parahaemolyticus virulence factors. In vitro cytotoxic activities of several Vibrio extracellular product were also observed among HeLa and Vero cells.

Badreddine Mechri, Amel Medhioub, Mohamed Nejib Medhioub, Mahjoub Aouni

Polish Journal of Microbiology , ISSUE 3, 307–318

Original Paper

Molecular Characterization of Shiga Toxin-Producing Escherichia coli Strains Isolated in Poland

, stx2g. Among STEC O157 strains we observed conserved core set of 14 virulence factors, stable in bacteria genome at long intervals of time. There was one cattle STEC isolate which possessed verotoxin gene as well as sta1 gene encoded heat-stable enterotoxin STIa characteristic for enterotoxigenic E. coli. To the best of our knowledge, this is the first comprehensive analysis of virulence gene profiles identified in STEC strains isolated from human, cattle and food in Poland. The results obtained

Aleksandra Januszkiewicz, Waldemar Rastawicki

Polish Journal of Microbiology , ISSUE 3, 261–269

Original Paper

Relationship between ureB Sequence Diversity, Urease Activity and Genotypic Variations of Different Helicobacter pylori Strains in Patients with Gastric Disorders

amino acid change in UreB sequence (Ala201Thr, 30%), showed no influence on urease activity. In conclusion, the supposed role of H. pylori urease to form peptic ulcer and advancing of intestinal metaplasia was postulated in this study. Higher urease activity in the colonizing H. pylori strains that present specific virulence factors was indicated as a risk factor for promotion of histopathological changes of gastric tissue that advance gastric malignancy.

Hossein Ghalehnoei, Alireza Ahmadzadeh, Nastaran Farzi, Masoud Alebouyeh, Hamid Asadzadeh Aghdaei, Pedram Azimzadeh, Mahsa Molaei, Mohammad Reza Zali

Polish Journal of Microbiology , ISSUE 2, 153–159

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