Protection wears off: The protection provided by a tetanus shot usually provides ample levels of circulating antibody protection for up to ten years. After that point it fades & the person may develop tetanus if exposed. Protection from tetanus & several other bacteria based vaccines does not last as long as most viral vaccines & must be boosted periodically to maintain protection.
Answered 5/18/2016
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Increase antibodies: Over time antibodies wane from previous tetanus immunization, so a booster is needed to increase the level of protection against the disease tetanus.
Answered 5/22/2015
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