?:definition
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formaldehyde inactivated toxin of Corynebacterium diphtheriae; generally used in mixtures with tetanus toxoid and pertussis vaccine; (DTP); or with tetanus toxoid alone (DT for pediatric use and Td, which contains 5 to 10 fold less diphtheria toxoid, for other use); diphtheria toxoid is used for the prevention of diphtheria.
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