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*''S. agalactiae, S. dysgalactiae'' and ''S. uberis'' primarily cause mastitis
*''S. agalactiae, S. dysgalactiae'' and ''S. uberis'' primarily cause mastitis
*Also ''S. pyogenes, S. zooepidemicus'' and ''Enterococcus faecalis'' can be involved
*''S. agalactiae colonises milk ducts causing persistent infections with acute outbreaks
*''S. dysgalactiae'' found in the oral cavity and on the skin of the udder causes acute mastitis
*''S. uberis'' inhabits normal skin, tonsils and vaginal mucosa, and causes mastitis without systemic signs
*Cause inflammation of mammary tissue and clots form in milk
*Milk samples are cultured on blood agar, Edward's medium and MacConkey agar for diagnosis
===Diagnosis===
*Swabs of pus or exudate cultured on blood agar and MacConkey agar
*Swabs of pus or exudate cultured on blood agar and MacConkey agar