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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.
DTaP is given to children younger than 7 years of age and Tdap is given to children, adolescents, and adults 7 years of age and older. Students who have already received a dose of Td (tetanus and diphtheria vaccine) at age 7 years or older must still receive a dose of Tdap.