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Corynebacterium bovis is a contagious, Gram-positive mastitis-causing pathogen. C. bovis will typically produce little to no growth on blood agar after 24
hours of culture, but it will show creamy, gray, or white nonhemolytic colonies at 48 hours. C. bovis is mildly pathogenic and will usually cause only a mild
increase in somatic cell count and a slight reduction in milk production. Information in this publication
was summarized from the National Mastitis Council’s Laboratory Handbook on Bovine Mastitis (Hogan et al. 1999).
Virginia Cooperative Extension materials are available for public use, reprint, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.
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