Selective Broth for MRSA is recommended for improved detection of Methicillin Resistant Staphylococcus aureus (MRSA).Selective Supplement for MRSA (FD299) is used for the selective growth of MRSA. It contains cefoxitin which is principally aimed at inducing the expression of methicillin resistance and inhibiting the growth of Methicillin Sensitive Staphylococcus aureus (MSSA). The supplement also contains aztreonam to inhibit most isolates of the family Enterobacteriaceae and colistin which is active against Pseudomonas species.