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  • Title: Characterization of methicillin resistant Staphylococcus aureus strains by a set of MRSA phages.
    Author: Mathur MD, Mehndiratta PL.
    Journal: Indian J Med Res; 2000 Mar; 111():77-80. PubMed ID: 10937382.
    Abstract:
    A recently developed international set of phages for typing methicillin resistant Staphylococcus aureus (MRSA) was used to characterize 300 strains of MRSA. The results were compared to that of phage typing with conventional phages and reverse phage typing. The use of MRSA phages increased the percentage typability from 17.6 per cent with the conventional set to 45.6 per cent with MRSA set and the strains were recognised as five distinct phage pattern viz., 622, M3/M5, MR8/MR12/MR25, 30/33/38 and mixed group. Phage type 622 was the most prevalent. On reverse phage typing 73 per cent strains could be typed with most strains belonging to one pattern i.e., 83A complex with limited discrimination. These 83A strains were highly resistant to erythromycin (98%) and tetracycline (93%). Our results show that MRSA phages are more useful in increasing typability and discrimination between the strains as compared to the conventional phages, reverse phage typing, and antibiogramtyping.
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