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NATtrol? Clostridium difficile Positive Control (MDZ040) is formulated with purified, intact Clostridium difficile bacterium that have been chemically modified to render them non-infectious and refrigerator stable.Each NATtrol? Clostridium difficile Positive Control contains 6 x 0.5 mL vials of NATtrolTM Clostridium difficile formulated in a Purified Protein Matrix that mimics the composition of a true clinical specimen.