What schedule should I use to vaccinate adolescents or adults who never received the primary series of tetanus toxoid-containing vaccine?

Children, age 7 years and older, and adults who have never received tetanus-containing vaccines, or whose vaccination history is unknown, should receive the 3-dose series. In this situation, ACIP recommends Tdap for dose #1, followed 4 weeks later by Td or Tdap for dose #2, followed at least 6 months later by Td or Tdap for dose #3. The amount of protection provided by one or more doses of Tdap in a person who has not previously received pertussis vaccine is not known. Following the primary series, booster doses of Td or Tdap should be given every 10 years thereafter.