How often should adult tetanus and diphtheria toxoids be repeated?

Adults should receive a booster dose of the tetanus and diphtheria toxoids (Td) every 10 years. However, if an adult sustains a wound that is particularly dirty or contaminated, a Td booster may be recommended if it has been more than 5 years since the last dose. Additionally, adults should receive a one-time booster of the tetanus, diphtheria, and pertussis vaccine (Tdap) if they have not previously received it, especially if they are in close contact with infants.