Tetanus antitoxin injection is necessary unless the last shot was administered within the past ____ years.

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Maintaining protection against tetanus relies on regular boosters of tetanus toxoid-containing vaccines. The antibody protection from these vaccines wanes over time, so a booster is given every 10 years to keep immunity up-to-date. Therefore, you wouldn’t typically need a tetanus booster if the last shot was within the past 10 years. If more time has passed, a booster is recommended to restore protection. In some wound situations, especially dirty or severe wounds, the timing can be stricter (boosters may be advised if the last dose was more than 5 years ago), and those without prior vaccination may require both the vaccine and immune globulin. The standard interval people use for a routine booster is 10 years.