نتایج جستجو برای: flaa
تعداد نتایج: 297 فیلتر نتایج به سال:
Sequences of three gene fragments (flaA, flaB, and vacA) from Helicobacter pylori strains isolated from patients in Germany, Canada, and South Africa were analyzed for diversity and for linkage equilibrium by using the Homoplasy Test and compatibility matrices. Horizontal genetic exchange in H. pylori is so frequent that different loci and polymorphisms within each locus are all at linkage equi...
Helicobacter pylori is the strongest known risk factor for gastric adenocarcinoma, yet only a fraction of infected persons ever develop cancer. The extensive genetic diversity inherent to this pathogen has precluded comprehensive analyses of constituents that mediate carcinogenesis. We previously reported that in vivo adaptation of a non-carcinogenic H. pylori strain endowed the output derivati...
In the presented paper, PCR-RFLP and RFLP-PFGE with two different enzymes were applied for the discrimination of 48 Campylobacter isolates from poultry carcasses and faeces. Both used typing methods had a typeability of 100% on this collection of the strains. PFGE with SacII enzyme was the most discriminatory method with the discrimination index of 0.98. Restriction analysis of the flaA gene al...
An outbreak of Legionnaires' disease at a long-term care facility in Ontario, Canada from September to October 2005 resulted in the death of 23 residents and the illness of 112 other people. In response, molecular methods were developed to detect Legionella pneumophila in clinical lung samples and to subtype isolates from clinical and environmental samples. The targeted genetic loci included Le...
The occurrence of Campylobacter in poultry meat and subsequent antibiotic resistance profiles of the isolates were investigated. The prevalence of Campylobacter in 101 samples was 87.1%. Of these samples, 54.5% contained Campylobacter coli and 45.5% were contaminated with Campylobacter jejuni. Among the strains tested, resistance to ciprofloxacin and nalidixid acid was the most common, followed...
Reducing colonization of poultry flocks by Campylobacter spp. is a key strategy in the control and prevention human campylobacteriosis. Horizontal transmission of campylobacters, from in and around the farm, is the presumed route of flock colonization. However, the identification and prioritization of sources are confounded by the ubiquitous nature of these organisms in the environment, their p...
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