What is the difference between the TDAP and DTAP vaccines? Some nurses/pharmacists told me they are the same, but I am not convinced.

If they are the same then why would some organizations request for you to specifically have the TDAP vaccine and won't accept the DTAP?

1 Answer 1


They are similiar, but for different age group.

  • DTAP for people under 7

  • TDAP for 11 and up basically.


DTaP is a vaccine that helps children younger than age 7 develop immunity to three deadly diseases caused by bacteria: diphtheria, tetanus, and whooping cough (pertussis). Tdap is a booster immunization given at age 11 that offers continued protection from those diseases for adolescents and adults.

They both cover the same illnesses, as well. The DTap probably isn't accepted due to the fact that it usually is taken around 7 years and so needs the booster shot TDap.

  • what if an adult took DTAP again instead of TDAP, would it be less effective?
    – HappyBee
    Jun 22, 2016 at 6:39
  • This would probably benefit from a different question. But the answer can be found here medscape.com/viewarticle/726330 . But no it wouldn't be less effective it would be more, the dtap is more antigen, the tdap is a booster. They would have a reaction to it, but be vacinated still.
    – Pobrecita
    Jun 22, 2016 at 14:02

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