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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. 
 
              Abstract 
 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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