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NATtrol? MRSA Positive Control (MDZ059) is formulated with purified, intact MRSA bacterium that have been chemically modified to render them non-infectious and refrigerator stable. Each NATtrol? MRSA Positive Control contains 6 x 0.5 mL vials of NATtrolTM MRSA formulated in a Purified Protein Matrix that mimics the composition of a true clinical specimen.