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Tetanus toxin
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==Immunity and vaccination== Due to its extreme potency, even a lethal dose of tetanospasmin may be insufficient to provoke an immune response. Naturally acquired tetanus infections thus do not usually provide immunity to subsequent infections. Immunization (which is impermanent and must be repeated periodically) instead uses the less deadly [[toxoid]] derived from the toxin, as in the [[tetanus vaccine]] and some [[combination vaccine]]s (such as [[DTP vaccine|DTP]]).
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