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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 is usually caused by a bacterial infection that has entered the tissue of the milk glands, either through the milk ducts or through an abrasion to the skin.ewborn guinea pigs are born with their teeth intact, so it is possible that a minor abrasion to the mother's skin can take place as the result of normal nursing. The abrasion then becomes an open point of entry for bacteria, leading to mastitis, or infection, of the milk glands.