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Research (Published online: 26-03-2015)

24. Typing of Staphylococcus aureus obtained from mastitic milk of cattle and buffalo on the basis of two virulence-associated genes (spa and clfA) - Rahul Yadav, Sandeep Kumar Sharma, Jyotika Yadav and Anil Kumar Kataria

Veterinary World, 8(3): 398-402

 

 

   doi: 10.14202/vetworld.2015.398-402

 

Rahul Yadav: Department of Veterinary Microbiology and Biotechnology, College of Veterinary and Animal Sciences, Rajasthan University of Veterinary and Animal science, Bikaner, Rajasthan, India; drrahul16889@gmail.com

Sandeep Kumar Sharma: Department of Veterinary Microbiology and Biotechnology. Post Graduate Institute of Veterinary Education and Research, Rajasthan University of Veterinary and Animal science, Jaipur, Rajasthan, India; drsharmask01@hotmail.com

Jyotika Yadav: College of Veterinary and Animal Sciences, Hisar, Lala Lajpat Rai University of Veterinary & Animal Sciences, Hisar, Haryana, India; drjyotika2910@gmail.com

Anil Kumar Kataria: Department of Veterinary Microbiology and Biotechnology, College of Veterinary and Animal Sciences, Rajasthan University of Veterinary and Animal science, Bikaner, Rajasthan, India; akkataria1@rediffmail.com

 

Received: 01-01-2015, Revised: 10-02-2015, Accepted: 16-02-2015, Published online: 26-03-2015

 

Corresponding author: Rahul Yadav, e-mail: drrahul16889@gmail.com


Citation: Rahul Yadav, Sandeep Kumar Sharma, Jyotika Yadav and Anil Kumar Kataria (2015) Typing of Staphylococcus aureus obtained from mastitic milk of cattle and buffalo on the basis of two virulence-associated genes (spa and clfA), Veterinary World 8(3):398-402.



Aim: The present study was undertaken to type Staphylococcus aureus isolates from cattle and buffalo mastitic milk on the basis of spa (X-region) and clfA genes, both responsible for producing virulence factors.

Materials and Methods: In the present investigation S. aureus isolates were isolated as per standard protocols. Typing of S. aureus was carried out by molecular detection of spa and clfA gene by polymerase chain reaction.

Results: All the 32 isolates from cattle (16) and buffalo (16) were divisible into seven spa types with amplicon sizes ranging between 120 and 380bp. The cattle isolates produced seven different spa amplicons of 120, 150, 200, 250, 280, 300, and 330 bp with 3, 4, 6, 8, 10, 11 and 12 number of tandem repeats, respectively whereas buffalo isolates were divisible into five spa types with amplicons of 150, 200, 250, 330 and 380 bp having calculated number of repeats of 5, 7, 9, 12, and 14, respectively. Of the total isolates, 24 were considered pathogenic on the basis of more than seven number of tandem repeats. In the present investigation, clfA gene was amplified in 27 isolates from cattle and buffalo producing two different amplicons of 900 and 1000 bp sizes showing polymorphism. The most (71.80%) of the isolates produced amplicons of 900 bp while amplicon size of 1000 bp was produced by four (12.5%) of the isolates.

Conclusion: The presence of these genes with a wide degree of polymorphism confirmed the pathogenic potential of S. aureus and their association with clinical manifestations in mastitis among cattle and buffalo.

Keywords: buffalo, cattle, clfA gene, mastitis, Staphylococcus aureus, spa (X-region) gene.



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