The production of biologics will always have the risk of viral contamination. Manufacturers have developed a multitiered approach — tailored to individual processes — to prevent adventitious viruses from entering production processes, detect contamination in raw materials and process intermediates, and remove viruses in downstream purification. This article provides an overview of the global regulatory framework to ensure the viral safety of biologics. Past Contamination Events Past contamination events have resulted in corrective and preventative actions to reduce the risk…