NATtrol™ Gastrointestinal Panels Verification Kit (NATGIPVK-DIA) includes positive and negative gastrointestinal verification panel controls. The positive controls contain purified, intact microorganisms and viruses that have been chemically modified to render them non-infectious and refrigerator stable and are formulated in a proprietary matrix. The negative control is formulated in the absence of any microorganisms or viruses and contains proprietary matrix only.