Surgery Endocrinology and breast 629f47f9 TRUE about bacterial mastitis is A Exclusively occurs is lactating breasts B Cleaningn baby's mouth offers protection C Most commonly caused by staphylococcus aureus D Fluctuation is an early sign of breast abscess High-Yield Explanation Most cases are caused by S. aureus and, if hospital acquired, are likely to be penicillin resistant. Most common variety of mastitis. Ref : Bailey and love 26thE pg820