DPT (also DTP and DTwP) refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis (whooping cough) and tetanus. The vaccine components include diphtheria and tetanus toxoids, and killed whole cells of the organism that causes pertussis (wP). DTaP (also known as Tdap,DTPa, and TDaP) refers to similar combination vaccines in which the pertussis component is acellular. Also available is the DT or TD vaccine, which lacks the pertussis component. In the Netherlands, the initialism DTP refers to a combination vaccine against diphtheria, tetanus, and poliomyelitis...