Application of Spa-Gene as A Marker of Molecular Epidemiology in the Case of Methicillin-Resistant Staphylococcus Aureus (MRSA) Which its from Dairy Cows in Surabaya Region

Asri Rizky, Mustofa Helmi Effendi, Jola Rahmahani


The aim of this study was to isolate and identify the strain of methicillin-resistant Staphylococcus aureus (MRSA) from cow’s milk in Surabaya and to determine the fragment Spa-Gene in MRSA strains. There were 50 samples of cow’s milk obtained from four dairy farms. From 50 tested samples, 19 samples (38%) were positive for Staphylococcus aureus. Antibiotic sensitivity test using oxacillin and erythromycin showed that 6 samples were resistant to the antibiotic oxacillin and 6 samples were resistant to erythromycin. MRSA confirmation tests that were conducted on 6 samples revealed 5 positive results for the MRSA strain. Electrophoresis of Polymerase Chain Reaction (PCR) product showed that 4 out of 5 samples were positive for the presence of the Spa-Gene fragment. The research results showed that there were 3 models of Spa-Gene fragments; the first had a length of 90 bp and 140 bp, the second had a length of 140 bp, and third had a length of 90 bp. This study revealed the nature of Spa-Gene polymorphism of MRSA strains isolated from milk samples. It was concluded that the Spa-Gene can be used as a molecular epidemiological marker of the MRSA strain.


methicillin-resistant Staphylococcus aureus (MRSA); Spa-Gene; polymorphism; Staphylococcus aureus


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