DTaP Tdap DTaP = Diphtheria, Tetanus, Pertussis (whooping cough) DTap tetanus-diphtheria-acellular pertussis DTaP Diphtheria, pertussis, acellular pertussis DTaP DTap approved for use by the FDA in 1997 Tdap = DTaP for older children and adults Tdap vaccine tetanus-diphtheria-acellular pertussis Tdap DTaP