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Stacy Wiegman, PharmD, Pharmacy, answeredThe DTP, also known as the diphtheria and tetanus toxoids and pertussis vaccine absorbed USP, is a vaccine no longer used in the United States. The vaccine has been replaced with the DTaP, which has less risk of side effects. Both versions of the vaccine provided protection from diphtheria, tetanus, and pertussis (whooping cough) and were designed for children under seven years of age. They work by exposing the body to very small amounts of the diseases, allowing the body to form antibodies that protect it from infection.