Year: 2022 | Month: June | Volume 12 | Issue 3
Cost Effective Screening and Characterization of Staphylococcus aureus and Methicillin-Resistant Staphylococcus aureus from Bovine Mastitis in India
The present study was conducted to characterize Staphylococcus aureus and methicillin-resistant Staphylococcus aureus (MRSA) in mastitic milk of cow using rapid and cost effective genotypic as well as phenotypic method. Different phenotypic and genotypic methods were compared in detection of S. aureus and MRSA. Present study also optimized and standardized the boiling and snap chilling method of genomic DNA extraction for rapid screening of S. aureus and MRSA in pure culture. Detection of species specific thermo nuclease (nuc) gene was found more sensitive than phenotypic test in identification of S. aureus whereas both rapid cultural methods such as cefoxitin disc diffusion test and use of chromogenic agar was found comparable to mecA gene based PCR in characterization of MRSA. Furthermore, despite less purity and minute concentration of DNA obtained from boiling and snap chilling method, there was no non-specific and cross reaction in PCR assay. Therefore the boiling and snap chilling method could be recommended as an alternative and economical method of genomic DNA extraction for rapid screening of S. aureus and MRSA particularly in developing countries like India.
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