1. Mannitol salt agarorMSAis a commonly usedselectiveanddifferentialgrowth medium.It contains a high concentration ofsaltwhich is inhibitory to most bacteria - making MSA selective against most Gram-negative and selective for some Gram-positive bacteria,that tolerate high salt concentrations. It is also a differential medium for mannitol-fermenting staphylococci, containing carbohydrate mannitoland the indicatorphenol red, which turns the media yellow by acid formed due to mannitol fermentation. The isolate on MSA is non mannitol fermententing, halotolerant, gram positive cocci which appear in culsters. suspecting Staphylococcus epidermadis

plan for the test