Vaccines contain not only the surface antigens from pathogens for which they are intended to provide immunity, but other animal, human and viral protein and cellular components, including fetal and tumor cells. This module explains the different types of foreign biological matter found in vaccines, and some of the potential problems arising from their use. [2 Videos, Length: Vid 1: 35, Vid 2: 18 min, Downloadable Material, Access to Forums]
