Tetanus is a serious bacterial infection caused by the bacterium Clostridium tetani. This bacterium produces a toxin that affects the nervous system, leading to muscle stiffness and spasms, particularly in the jaw and neck. Tetanus can occur after a wound becomes contaminated with the bacteria, often from soil or animal feces. Vaccination is the best way to prevent tetanus. The tetanus vaccine is usually given in childhood and requires booster shots every ten years. If left untreated, tetanus can lead to severe complications and can be life-threatening, making prompt medical attention essential.