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NATtrol? Clostridium difficile Negative Control (MDZ041) is formulated with purified, intact Clostridium sordellii bacterium that have been chemically modified to render them non-infectious and refrigerator stable. Each NATtrol? Clostridium difficile Negative Control contains 6 x 0.5 mL vials of NATtrolTM Clostridium sordellii formulated in a Purified Protein Matrix that mimics the composition of a true clinical specimen.