This document discusses the significance of toxoids in active immunity. It defines key terms like vaccines, toxoids, live vaccines, attenuated live vaccines, inactivated vaccines, polysaccharide vaccines, and surface antigen vaccines. It explains that toxoids create immunity to the toxins produced by pathogens rather than the pathogens themselves. Various routes of administration are outlined including subcutaneous, intramuscular, oral, intradermal, and intranasal. Vaccination schedules for primary vaccination and booster doses are also summarized.