difference between DTaP and dTaP

Last edited 04/2019 and last reviewed 04/2019

Difference Between DTaP and dTaP

  • Diphtheria containing vaccines are produced in two strengths according to the diphtheria toxoid content:
    • vaccines containing the higher dose of diphtheria toxoid (abbreviated to 'D') contain not less than 30IU
    • vaccines containing the lower dose of diphtheria toxoid (abbreviated to 'd') contain approximately 2IU

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