A chemically modified toxin from a pathogenic microorganism, which is no longer toxic but is still antigenic and can be used as a vaccine.
- No evidence shows an increased risk from vaccinating pregnant women with inactivated virus or bacterial vaccines or toxoids.
- One part of the schedule lists immunizations indicated by age, particularly influenza, tetanus and diphtheria toxoids, and pneumococcal polysaccharide vaccine.
- Active immunization by vaccination with tetanus toxoid (an inactivated form of the toxin) is now usual in childhood, along with diphtheria and whooping cough vaccines.
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