Viral safety is a key concern for monoclonal antibodies (mAb’s) and other biologics intended for human use. MAb-producing rodent cell cultures (such as murine hybridomas and transfected CHO cells) produce type C retrovirus particles (up to 109/mL), because the rodent genome contains multiple copies of endogenous retrovirus-like sequences. Retrovirus Assay Service https://qvirus.creative-biogen....e.com/services/retro