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Bacteria that are known to cause mastitis include: 1  Pseudomonas aeruginosa. 2  Staphylococcus aureus. 3  Staphylococcus epidermidis. 4  Streptococcus agalactiae. 5  Streptococcus uberis. 6  Brucella melitensis. 7  Corynebacterium bovis. 8  Mycoplasma spp.
Mastitis occurs when the teats of cows are exposed to pathogens which penetrate the teat duct and establish an infection in one or more quarters within the udder. The course of an infection varies, most commonly it persists for weeks or months in a mild form which is not detected by the stockman (ie.