They are usually given together in one vaccine, called a DPT vaccine. Diphtheria Diphtheria causes a thick covering in the back of the throat. It can lead to breathing problems, paralysis, heart failure, and even death. Tetanus can lead to death.
Pertussis causes coughing spells so bad that it is hard for infants to eat, drink, or breathe.
These can last for weeks. Diphtheria, tetanus, and pertussis vaccines prevent these diseases. Most children who get all their shots will be protected during childhood. Many more children would get these diseases if we stopped vaccinating. DT protects against diphtheria and tetanus, but not pertussis.