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If you ever step on a rusty nail, you may wonder: “When was my last tetanus shot?” But you might not need one. Until now, doctors would vaccinate for both tetanus and diphtheria in childhood… and recommend booster shots every decade. But Oregon Health and Science University researchers compared immunity levels of hundreds of adults who had and hadn’t had booster shots. The result: Tetanus and diphtheria antibodies last at least 30 years from ONE shot. Still not sure when you were last vaccinated? Ask your doctor if your 30-year anniversary for tetanus and diphtheria is coming up.