conclusions the relative higher frequency of some virulence genes in this study may reflect the emergence of isolates containing these genes in shiraz medical centers. background staphylococcus aureus is amongst major human pathogens both in hospitals and the community. this bacterium is an opportunistic pathogen responsible for a large number of self-limiting and even life-threatening diseases...

Aeromonas hydrophila secretes several extracellular proteins including enterotoxin, hemolysin and aerolysin that are associated with the bacterial virulence. Previous studies have shown that two hemolytic toxins, hemolysin A and aerolysin A contribute to the virulence of Aeromonas hydrophila. In the current study, a total of 50 strains of Aeromonas hydrophila, including 28 (56%) strains isolate...

Part of the Thesis of the first author. Universidade Federal de Viçosa. Viçosa MG. 2004. *Present Address: Laboratório de Microbiologia Agrícola, ICA, Universidade Federal Rural da Amazônia, 66077-530, Belém, PA, Brazil ABSTRACT Genetic and phenotypic structure of Magnaporthe oryzae populations of two upland rice cultivars was determined. Monoconidial isolates were obtained from rice blast aff...

cytospora dieback and canker disease is one of prevalent disease of walnut trees in iran caused by several species of cytospora genus. the aim of this study was to determination of virulence degree in 58 isolates of dominant species, cytospora chrysosperma. isolates from 12 provinces of iran; hamedan, kurdistan, kermanshah, ilam, west azarbaijan, zanjan, markazi, lorestan, chaharmahal va bakhti...

Background: Campylobacter is recognized as a major cause of foodborne gastroenteritis in humans in many countries and may be transferred from animals to humans. The consumption of chicken meat is identified as a major cause of Campylobacter infection in humans. Aims: To find out the contamination rate of chicken meat with Campylobacter</em...

BACKGROUND: Colibacillosis is one of the most prevalentdiseases in the world that causes multimillion-dollar annuallosses. OBJECTIVES: In order to evaluate molecular epidemiologyof some virulence associated factors in Escherichia coli,isolated from poultry, the presence of iut A, iss, hly F, omp T, iroN, afa, sfa (S)and pap G (II) were investigated by multiplex PCRassay. METHODS: Two hundred th...

salmonella is one of the most important zoonotic pathogens with many virulence factors playing a major role in its pathogenesis. the aims of this study were to detect spva, int2 and invc virulence genes of different salmonella serotypes isolated from various clinical animal and human sources, and to investigate antibiotic resistance patterns among these serotypes. using a pcr assay, a total of ...

ABSTRACT One hundred two single zoospore isolates of Phytophthora infestans, derived asexually from four parental isolates of US-8 genotype and one isolate of US-1 genotype, were characterized for their virulence phenotypes to determine changes in virulence during asexual reproduction. Potato differentials, each containing a major gene for resistance to P. infestans (R1 to R11), were used to ch...