What are bacterial vaccines based on purified toxoids?

— Exotoxins of Clostridium tetani and Corynebacterium diphtheriae are responsible of their pathogenicity — Toxoids are modified non pathogenic exotoxins — Neutralizing anti-toxoid antibodies are efficient in preventing intoxication Toxins enter cells via cellular receptors, then dissociate releasing active chain which poison cells, protected by Ab blocking the toxin.