FYI - Per the Mayo Clinic:
Tetanus, diphtheria and pertussis
- Who needs it. Get the combined tetanus, diphtheria and pertussis (Tdap) vaccine if you're age 19 to 64 and had your last tetanus vaccine more than 10 years ago, you have a wound likely to become infected and your last tetanus vaccine was five or more years ago, you have close contact with infants, you just gave birth and haven't had a Tdap vaccine, or you might become pregnant. Get a tetanus-diphtheria (Td) booster if you're age 65 or older and had your last tetanus vaccine more than 10 years ago.
- When to have it. Get one dose of Tdap if you never finished the tetanus-diphtheria (Td) series or don't know if you ever had the Td vaccine. Get a second dose four weeks after the first dose. Get a third dose six to 12 months after the second dose. If you're age 19 to 64 and due for a Td booster but haven't previously received Tdap, get one dose of the Tdap vaccine at any time. Get a Td booster every 10 years.
- Who shouldn't have it. The Tdap vaccine isn't recommended if you had an allergic reaction to a previous dose of the Td or Tdap vaccine, you're pregnant, you experienced a coma or seizures within seven days of a previous pertussis vaccine, or you're currently ill. Consult your doctor if you have epilepsy or you've had Guillain-Barre syndrome.