Coagulase-negative staphylococci—Emerging mastitis pathogens

Abstract

To cite this version:Satu Pyörälä, Suvi Taponen. Coagulase-negative staphylococci -emerging mastitis pathogens. Veterinary Microbiology, Elsevier, 2009, 134 (1-2) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 Coagulase-negative staphylococci (CNS) have become the most common bovine mastitis 3 isolate in many countries and could therefore be described as emerging mastitis pathogens. The 4 prevalence of CNS mastitis is higher in primiparous cows than in older cows. CNS are not as 5 pathogenic as the other principal mastitis pathogens and infection mostly remains subclinical. 6However, CNS can cause persistent infections, which result in increased milk somatic cell count 7 (SCC) and decreased milk quality. CNS infection can damage udder tissue and lead to decreased 8 milk production. Staphylococcus simulans and Staphylococcus chromogenes are currently the 9 predominant CNS species in bovine mastitis. S. chromogenes is the major CNS species affecting 10 nulliparous and primiparous cows whereas S. simulans has been isolated more frequently from 11 older cows. Multiparous cows generally become infected with CNS during later lactation whereas 12 primiparous cows develop infection before or shortly after calving. CNS mastitis is not a 13 therapeutic problem as cure rates after antimicrobial treatment are usually high. Based on current 14 knowledge, it is difficult to determine whether CNS species behave as contagious or 15 environmental pathogens. Control measures against contagious mastitis pathogens, such as post-16 milking teat disinfection, reduce CNS infections in the herd. Phenotypic methods for 17 identification of CNS are not sufficiently reliable, and molecular methods may soon replace 18 them. Knowledge of the CNS species involved in bovine mastitis is limited. The dairy industry 19 would benefit from more research on the epidemiology of CNS mastitis and more reliable 20 methods for species identification. 21 22

The prediction of the prevalence and risk factors for subclinical heifermastitis in Turkish dairy farms

“…Following CNS, S. aureus was the most frequent. The high prevalence of CNS in this study is similar to other researchers' results (13)(14)(15)(16)(17). The high prevalence of CNS may contribute to the presence of these microorganisms on the skin of teats saprophytically.…”

Ação dos desinfetantes sobre a adesão e biofilme consolidado de Staphylococcus spp.

“…No entanto, tanto o clorexidine quanto o iodo, apresentaram um efeito significativo na redução do biofilme formado por SCN (Fig.2). Isso pode ser explicado pela menor virulência apresentada por estes isolados, que geralmente causam mastites mais brandas, nas quais os animais respondem bem ao tratamento (Pyorala & Taponen 2009). Salientamos a importância da utilização de desinfetantes no pós-dipping na prevenção da adesão bacteriana, com intuito de retardar a formação do biofilme, uma vez que, eliminar ou reduzir a biomassa bacteriana e extremamente difícil.…”

Antibiotic Resistance in Staphylococcus Species of Animal Origin

“…Nowadays these bacteria are of great interest in veterinary medicine because they are currently considered emerging pathogens of bovine mastitis. Although CNS are not as pathogenic as the other principal mastitis pathogens and infection mostly remains subclinical, they can cause persistent infections, which result in increased milk somatic cell count (SCC) and decreased milk quality (Pyorala & Taponen, 2009). The prevalence of CNS mastitis is higher in primiparous cows than in older cows.…”