There is often confusion between the different vaccines that protect against tetanus, diphtheria and pertussis. DTaP, Td, and Tdap are all different vaccines, and they are used in different populations, from infancy to older adulthood.
A quick primer on the alphabet:
DTaP is the vaccine used in infants and children up to 6 years old. Vaccination starts at 2 months old, and is normally given at 2, 4, and 6 months of age, with a booster dose at age 4-6 years. For the very young, pertussis (the "P") is a key part of the protection, as pertussis can be life-threatening in newborns. The prior version of this vaccine, called DTP (no "a" for "acellular" pertussis) was very effective but caused a lot of high fevers and behavioral changes and was phased out starting in 1998.
Tdap is the version given at age 11 years; only once (for now) unless you are a woman and become pregnant – then you get an additional with each pregnancy (see above). Protection lasts 10 years against tetanus BUT we know that the pertussis protection wears off much earlier. Someday this is likely to be replaced by a more effective version that gives more pertussis immunity.
Td (tetanus and diphtheria components only) is the version that adults get every 10 years, or after 5 years with a "dirty wound". May be replaced by Tdap in the future if a more effective version of it gets approved.
Dosing:
Infants and young Children receive DTaP:
Preteens receive Tdap:
Pregnant women receive Tdap:
Everyone else who has received one dose of Tdap already receive Td:
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