Tetanus shots generally provide protection for about 10 years. After the initial series of tetanus vaccinations (usually given in childhood), booster shots are recommended every 10 years to maintain immunity against tetanus

. Details:

• The initial tetanus vaccination series consists of three shots spaced over several months.
• Following this, adults should receive a tetanus booster every 10 years to ensure continued protection.
• If a person sustains a deep or dirty wound and it has been more than 5 or 10 years since their last booster, a booster shot may be recommended sooner.
• Some research suggests immunity might last longer (up to 30 years), but current health guidelines still recommend boosters every 10 years for adults

Summary:

Stage| Recommended Interval for Tetanus Shot
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Initial series| 3 doses over 6-12 months
Booster shots (adults)| Every 10 years
Possible extended immunity| Up to 30 years (under study, not yet standard)

Thus, to stay protected against tetanus, adults should get a booster shot every 10 years after completing the initial vaccination series