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Coagulase-negative staphylococci (CNS) and Staphylococcus hyicus are mastitis-causing pathogens that originate from skin flora and are generally
considered to be the most commonly isolated pathogens in well-managed herds. A prevalence of 10
to 15 percent infected quarters is common (Hogan et al. 1999), but an intramammary infection rate as high as 43 percent of infected quarters is reported in some studies (Dufour et al. 2012).
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Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; M. Ray McKinnie, Administrator, 1890 Extension Program, Virginia State University, Petersburg.
April 11, 2016