Usually a life time: The diptheria toxoid is very immunogenic so it's immunity lasts a lifetime. Diptheria is combined with tetanus and pertussis. The tetanus component needs to be given every 5-10 years.
Answered 2/20/2017
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Boosters needed: The official recommendation is that one should receive a tetanus-diphtheria adult booster once every ten years to keep up immunity to both diseases.
Answered 3/17/2017
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