Diphtheria is a bacterial infection that affects the mucous membranes of the throat and nose, leading to severe breathing difficulties, heart failure, paralysis, and even death. Tetanus, also known as lockjaw, is caused by a toxin produced by the bacterium Clostridium tetani. It leads to severe muscle stiffness and spasms, which can be fatal if not treated promptly. Pertussis is a highly contagious respiratory disease known for severe coughing spells that can make it difficult for infants and young children to breathe, eat, or drink.
