MeReSa Agar Base is recommended for the selection, isolation and identification of Methicillin Resistant Staphylococcus aureus from clinical specimens. Lithium chloride and methicillin inhibit most of the contaminating microflora except methicillin-resistant S.aureus (MRSA). Glycine and sodium pyruvate enhance the growth of Staphylococcus species. Colour of the colonies is due to the indicator mixture and mannitol used in the medium. Staphylococcus aureus (MRSA) appear as pink coloured colony.