Tetanus, diphtheria, and pertussis are serious bacterial infections. Tetanus causes painful tightening of the muscles, usually all over the body. It can lead to "locking" of the jaw. Diphtheria usually affects the nose and throat. Whooping cough, tetanus, and diphtheria are serious diseases caused by bacteria.
For more information visit:
https://specialistmedicals.doodlekit.com/blog/entry/16667409/different-types-of-diseases-for-which-kids-receive-vaccine