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Updated: Sep 14, 2025
Genotyping of Staphylococcus aureus by Ribosomal Spacer PCR RS-PCR
Published on: November 4, 2016
Genome sequences of three methicillin-resistant Staphylococcus aureus strains isolated from subclinical mastitic cows
Eaftekhar Ahmed Rana1, Sifatun Nur2, Md Abul Fazal1
1Department of Microbiology and Veterinary Public Health, Faculty of Veterinary Medicine, Chattogram Veterinary and Animal Sciences University, Chattogram, Bangladesh.
Abstract:
Methicillin-resistant Staphylococcus aureus (MRSA) in bovine milk poses a significant zoonotic and antimicrobial resistance threat. This study identifies three MRSA strains from subclinical mastitic (SCM) cow milk, carrying resistance genes to β-lactams, lincosamides, macrolides, streptogramin B, and aminoglycosides, underscoring the urgent need for improved hygiene and surveillance in dairy production.
Insights
Methicillin-resistant Staphylococcus aureus (MRSA) in cow milk is a zoonotic and antimicrobial resistance threat. Three MRSA strains from subclinical mastitic milk showed resistance to multiple antibiotics, highlighting dairy hygiene needs.
Area of Science:
- Veterinary Microbiology
- Food Safety
- Antimicrobial Resistance
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant zoonotic risk.
- MRSA in bovine milk is a growing concern for public health and the dairy industry.
- Antimicrobial resistance (AMR) necessitates understanding pathogen reservoirs in livestock.
Purpose of the Study:
- To identify and characterize MRSA strains in milk from subclinically infected cows.
- To determine the antimicrobial resistance profiles of isolated MRSA strains.
- To assess the implications of MRSA in bovine milk for dairy production and public health.
Main Methods:
- Bacteriological isolation and identification of Staphylococcus aureus from milk samples.
- Phenotypic and genotypic methods for MRSA confirmation.
- Antimicrobial susceptibility testing to evaluate resistance patterns.
Main Results:
- Three distinct MRSA strains were successfully isolated from subclinical mastitic cow milk.
- The identified MRSA strains exhibited resistance to multiple antibiotic classes, including beta-lactams, lincosamides, macrolides, streptogramin B, and aminoglycosides.
- Presence of specific resistance genes conferring multi-drug resistance was confirmed.
Conclusions:
- MRSA strains in bovine milk are a reservoir for zoonotic transmission and AMR.
- Subclinical mastitis cases harbor multi-drug resistant MRSA, posing a threat to animal and human health.
- Enhanced hygiene protocols and robust surveillance are crucial in dairy farming to mitigate MRSA spread.
