what is tdap vaccine
Tdap (Tetanus, Diphtheria, Pertussis) Vaccine. Tdap vaccine protects against tetanus, diphtheria, and whooping cough (pertussis) . Teens and adults should get Tdap vaccine in order to: 1  Help protect themselves against whooping cough and prevent the spread of disease to others.2  Help protect babies from whooping cough.3  Babies have the highest risk of serious illness from whooping cough.eens and adults should get Tdap vaccine in order to: 1  Help protect themselves against whooping cough and prevent the spread of disease to others. 2  Help protect babies from whooping cough. 3  Babies have the highest risk of serious illness from whooping cough.