noun Immunology.

  1. a mixture of toxin and antitoxin, formerly used to induce active immunity against certain diseases, especially diphtheria.


  1. a mixture of a specific toxin and antitoxin. The diphtheria toxin-antitoxin was formerly used in the US for active immunization


  1. A mixture of a toxin and its antitoxin with a slight excess of toxin, formerly used as a vaccine.

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