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Difference between DTaP and dTaP

Authoring team

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

References:

  • Immunisation Against Infectious Disease - "The Green Book". Chapter 24. Pertussis (April 2019).
  • Immunisation Against Infectious Disease - "The Green Book". Chapter 15. Diptheria (April 2019).

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