What is the recommended interval for tetanus booster vaccination in adults who completed a primary tetanus-containing series?

• A. Every 5 years
• B. Every 10 years
• C. Every 15 years
• D. Never

Answer: (B)

Immunity from tetanus protection wanes over time, so adults who completed the initial tetanus-containing vaccination need periodic boosters to stay protected. The recommended interval is to receive a tetanus booster about once every decade. The typical plan is to give a Tdap dose once in adulthood (to also protect against pertussis), then tetanus-diphtheria boosters at roughly decade intervals thereafter. In wound situations, boosters may be indicated sooner depending on the wound type and time since last dose, but for routine protection the interval is a decade. So a shorter interval, a longer interval, or never would not align with standard practice.