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Tdap is given only once during your lifetime. However, you may need routine booster shots of the Td vaccine every 10 years to adequately protect you against tetanus and diphtheria.
The current recommendation is that one dose of the Tdap vaccine be substituted for one dose of the Td vaccine between the ages of 11 and 64. Pregnant women are also advised to get the Tdap vaccine, preferably between 27 and 36 weeks' gestation.t is often called a booster dose because it boosts the immunity that wanes from vaccines given at ages 4 to 6. Immunity wears off over time. So, the current recommendation is that everyone needs a booster shot for tetanus and diphtheria every 10 years after first being immunized.