On Dec. 30, 1996, the Food and Drug Administration (FDA) announced it had licensed three DTaP vaccines for use among children aged 6 weeks-6 years.

Tripedia{Registered} was licensed for the initial four doses, and ACEL-IMUNE{Registered} for all five doses of the diphtheria, tetanus and pertussis vaccination series. A third DTaP vaccine (Infanrix TM) was licensed in January 1997 for the initial four doses of the series.