Coagulase-negative Staphylococci (CNS) are normally found at the level of the teat, nasal mucosa, as well as on the hands of milking personnel. The CNS group is made up of over 50 bacteria and are most frequently isolated from infected glands. This group includes S. chromogenes, S. hyicus, S. simulans, and S. epidermidis. S. xylosus, S. saprophyticus, S. sciuri, and S. cohni are Novobiocin-resistant Staphylococci and found as free-living in the environment. These bacteria are considered environmental causes of mastitis. Due to their high prevalence, CNS infections are usually subclinical, but can result in a 2-3 times increase in SCC within the infected quarter. The amount of increase in SCC is reflective of the Staphylococcus species causing the infection.
Mastitis: Coagulase Negative Staphylococci Diagnostic Aid
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