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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.
Vaccination is the only way to protect against tetanus. Due to widespread immunization, tetanus is now a rare disease in the US. A combination booster vaccine, called Tdap, protects against tetanus, diphtheria, and pertussis (whooping cough). Tdap should be given to all adults once in place of one Td (tetanus-diphtheria) booster vaccine, which is recommended every 10 years. Adults who were never fully immunized against tetanus should start with a three-dose primary series given over seven to 12 months.