(tok'soyd‵ )

[ tox(in) + -oid ]

A toxin chemically modified to retain its antigenicity but no longer poisonous. SYN: anatoxin.

alum-precipitated t.Toxoid of diphtheria or tetanus precipitated with alum.

diphtheria t.Diphtheria toxin altered so that it cannot cause disease but is still able to stimulate the production of antibodies for active immunization. It is used in diphtheria-pertussis-tetanus vaccine (DTaP).

tetanus t.Tetanus toxin modified so that its toxicity is greatly reduced but retaining its capacity to promote active immunity.

SEE: toxin.