Mastitis caused by Staphylococcus aureus is a major problem for some dairy herds. It causes high Somatic Cell Counts (SCC), reduces milk quality, and may cause a loss of milk market. It limits milk production for the herd, reduces efficiency, and continues to spread to other cows.
Bagley, Clell, "Staph Mastitis: Herd Control Program" (1997). All Current Publications. Paper 422.