Detection of virulence-associated genes in Staphylococcus aureus isolated from bovine clinical mastitis milk samples in Guangxi
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Abstract
Staphylococcus aureus is recognized worldwide as a pathogen causing many serious diseases in humans and animals and is one of the most common etiological agents of clinical and subclinical bovine mastitis. The purpose of this study was to determine the presence of genes encoding clfA, fnbA, fnbB, cap5, cap8, hla, hlb, nuc, sea, and tst of S. aureus strains (n = 39) isolated from bovine clinical mastitis in Guangxi by polymerase chain reaction amplification. The results of the present study indicated that all isolates were found to contain one or more virulence-associated genes. The most frequently encountered genes were fnbA (97 %) and nuc (90 %), followed by hla (85 %) and hlb (82 %), respectively. None of the investigated S. aureus strains harbored fnbB and sea genes. The data in the present study showed a relatively wide distribution of the genes fnbA and nuc among the investigated isolates, indicating that they play an important role on bovine mastitis pathogenesis. The study provides a valuable insight into the virulence-associated genes of this important pathogen.
Keywords
Bovine mastitis Staphylococcus aureus Virulence-associated genes Polymerase chain reaction (PCR)Abbreviations
- S. aureus
Staphylococcus aureus
- clfA
Clumping factor A
- fnbA
Fibronectin-binding protein A
- fnbB
Fibronectin-binding protein B
- cap5
Capsular polysaccharide 5
- cap8
Capsular polysaccharide 8
- hla
α-Hemolysin
- hlb
β-Hemolysin
- nuc
Thermonuclease
- sea
Enterotoxin A
- tst
Toxic shock syndrome toxin 1
- PCR
Polymerase chain reaction
Notes
Acknowledgments
The authors would like to thank Prof. B. X. He, Prof. X. B. Zheng, and Dr. G. H. Li of Guangxi University for their experimental advices. This work was jointly funded by the “948” Project (Ministry of Agriculture of China, no. 2011-G26) and Guangxi Department of Science and Technology (nos. 1123005-1, 1123005-3, and 2010GXnsFA013096).
Conflict of interest
The authors declare that they have no conflict of interest.
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