Why DPT is called an triple antigen a written answer?

DPT is called a triple antigen because it combines three vaccines in one shot: diphtheria, pertussis (whooping cough), and tetanus. Each component protects against a different bacterial disease, providing comprehensive immunization. This combination simplifies the vaccination schedule and enhances public health by promoting higher vaccination rates. The "triple" designation reflects the three distinct diseases that the vaccine targets.