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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.
Td (tetanus and diphtheria) is also a vaccine used as a booster vaccination in adolescents and adults, however, it does not contain the pertussis vaccine. DTaP should be given at two, four, six, 15 to 18 months of age, and between four and six years of age. The preferred age for Tdap vaccination is 11 to 12 years.