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It is not known how long the Tdap vaccine will provide protection against pertussis. A booster dose (of Td only) is recommended for adults every 10 years. The booster dose may be needed sooner if an adult gets a dirty wound or cut.
Another vaccine, called Td, protects against tetanus and diphtheria, but not pertussis. A Td booster should be given every 10 years. Tdap may be given as one of these boosters if you have never gotten Tdap before. Tdap may also be given after a severe cut or burn to prevent tetanus infection.