In the realm of biologic manufacturing, the risk of introducing an infectious virus into the drug substance bulk harvest is one of the fundamental concerns articulated within the International Council for the Harmonisation of Technical Requirements for Pharmaceuticals for Human Use (ICH) Q5A(R2) Viral Safety Evaluation of Biotechnology Products Derived From Cell Lines of Human or Animal Origin.
Why the concern? Have there been known viral contamination events leading to lot rejection during biologic manufacture? The answer is yes, though rarely. These events often have been attributed to the use of animal-derived raw materials (ADM), such as fetal bovine serum or porcine trypsin. Have such viral contaminants ever made it into commercial drug products administered to humans? Yes, two instances come to mind.








