most common bacteria in mastitis
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.