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Staphylococcus aureus  is a major causative agent leading to bovine mastitis and has specific phonotypical characteristics including small colony, slow growth, and decreased hemolysis, therefore named as the small colony variants (SCVs). Out of 30 tested samples of the chronic  S. aureus  cases, one strain of SCVs ( S. aureus  SCV22) was isolated along with its parental strains ( S. aureus 11).  S. aureus  SCV22 showed a slow growth rate when it is compared with the parental strain. However, their resistant patterns were similar. Meanwhile,  S. aureus  SCV22 depicted the lower rate of apoptosis in bovine mammary epithelial cells. These findings of the present study presented the unique characteristics of  S. aureus  SCV22 for the first time in Yunnan province, which provided a prophase foundation for further study about the pathogenesis of  S. aureus  SCVs in chronic mastitis.

The Characteristics ofStaphylococcus aureusSmall Colony Variant Isolated from Chronic Mastitis at a Dairy Farm in Yunnan Province, China