NATtrol™ Meningitis/Encephalitis (ME) Controls contain purified, intact microorganisms and viruses that have been chemically modified to render them non-infectious and refrigerator stable. The controls are formulated in a proprietary matrix. NATtrol™ Meningitis/Encephalitis (ME) Controls are full process controls designed to monitor the steps of extraction, amplification, and detection in nucleic acid testing procedures.