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Medical Definition of Diphtheria-tetanus-pertussis vaccine
1. A vaccine consisting of diphtheria toxoid, tetanus toxoid, and pertussis vaccine. It is usually given to infants three times at two-month intervals, generally at 2, 4, and 6 months of age. The vaccine protects against diphtheria, tetanus, and whooping cough. In most cases the vaccine causes only a temporary fever and discomfort, but in a few cases serious neurological side effects have been observed. (12 Dec 1998)