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toxin-antitoxin/tox·in-an·ti·tox·in/ (TA) (tok″sin-an´tĭ-tok″sin) a nearly neutral mixture of diphtheria toxin with its antitoxin; used for diphtheria immunization.
A mixture of a toxin and its antitoxin with a slight excess of toxin, formerly used as a vaccine.
Etymology: Gk, toxikon, poison, anti, against, toxikon
a mixture of toxin and antitoxin. Diphtheria toxin-antitoxin was formerly used for active immunization.
An infrequently used mixture of a toxin and an antibody that blocks its effects. It was formerly used in some vaccine formulations.