The DPT vaccine, also known as the triple antigen or the pertussis vaccine, is a vaccine that is commonly administered to infants and young children to prevent diphtheria, pertussis, and tetanus. The acronym DPT is derived from these three diseases. However, there are other synonyms for the DPT vaccine that may be used interchangeably, such as the DTaP vaccine, the Tdap vaccine, and the triple vaccine. The DTaP vaccine is the version given to infants and young children, while the Tdap vaccine is given to adolescents and adults as a booster shot. The triple vaccine is a broader term that refers to any vaccine that contains three different antigens.