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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.
Background. Mastitis is a bacterial infection of the udder (mammary gland). Each year around 50% of cows suffer from mastitis and about 1 in 4 of these die or are culled.It is the most common cause of disease and death in dairy cows.Mastitis is managed by good hygiene along with treatment and/or prevention by antibiotics administered via the teat. Over 150 types of bacteria can cause mastitis with five bacterial types believed to cause most cases.t is the most common cause of disease and death in dairy cows. Mastitis is managed by good hygiene along with treatment and/or prevention by antibiotics administered via the teat. Over 150 types of bacteria can cause mastitis with five bacterial types believed to cause most cases.