Mannitol Salt Agar (MSA), is a selective and differential medium used for the isolation, enumeration, and differentiation of staphylococci. Chapman formulated Mannitol Salt Agar to isolate staphylococci by inhibiting growth of most other bacteria with a high salt concentration. Pathogenic strains of staphylococci (coagulase-positive staphylococci) grow luxuriantly and produce yellow colonies with yellow zones. Non-pathogenic staphylococci produce small red colonies with no color change to the surrounding medium. Mannitol Salt Agar is highly selective and samples from heavily contaminated sources may be streaked onto this medium without risk of overgrowth. • Product meets BAM, CLSI, and Harmonized USP/EP/JP reference methods and performance criteria.• MSA should be used by trained professionals within a laboratory setting. • For in vitro diagnostic (IVD) use.• Product is not intended for use in the diagnosis or treatment of disease or other human conditions.