S Aureus Research Paper

Being a transmissible mastitis bacterium, S. aureus represents a risk for mastitis outbreaks occurring in a herd [201], and it is important to monitor herds where S. aureus frequently causes IMI. S. aureus has been isolated from the majority of dairy herds in many locations. In Ontario, Canada, S. aureus-infected cows were detected in 92% of the herds [202]. On Prince Edward Island, Canada, S. aureus was recorded in 70% of the herds studied by [203]. In the same area, at least 74% of the herds probably had at least one cow with S. aureus IMI, as estimated by analysis of three bulk milk cultures taken at weekly intervals [142]. In accordance with many studies [204, 205]S. aureus was common in the environment and body sites of dairy cows, including non-mastitic cows in this study. The majority of the cows in the herds of the present study had the pathogen, but in some herds S. aureus has been unusual in samples other than milk [201]. The prevalence of S. aureus in dairy cow body sites can differ markedly even …show more content…
aureus ability to adhere and form biofilm on host surfaces, and resistance to phagocytosis [210]. The production of biofilm by the microbes is reflected as a significant virulence factor responsible for connection of these microorganisms with living or non-living surfaces. Biofilm contents make a publication of bacteria and support them to stay alive in unfavorable environmental conditions. Staphylococcus aureus isolates which create biofilm lead to chronic mastitis in dairy animals as it lets the bacteria more resistant to most of the antimicrobials and the phagocytosis. A number of studies were shown that formation of biofilm in S. aureus causing catheter related and nosocomial contaminations is linked with the presence of icaA and icaD genes [211]. However, the prevalence of ica genes, and their role in biofilm creation in S. aureus strains causing bovine mastitis have not been previously