Is micrococcus luteus mannitol salt negative?

Yes, Micrococcus luteus is mannitol salt negative. This means it does not ferment mannitol in the presence of high salt concentrations, which is a key characteristic used to differentiate it from other species such as Staphylococcus aureus, which can ferment mannitol. As a result, Micrococcus luteus typically does not produce acid or change the color of mannitol salt agar.