The latest Tweets from Laurene Powell (@laurenepowell). President of @EmCollective. âWhat you do speaks so loudly that I cannot hear what you say,â Ralph Waldo Emerson. Palo Alto, CA
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.
Causes of Mastitis. Causes of Mastitis. Mastitis is caused by bacteria, usually Staphylococcus aureus, which is found on normal skin. Most likely S. aureus from the baby's nasal passages enters the breast tissue through a break or crack around the nipple area.