Clostridium tetani is a bacterium that causes tetanus, a serious disease characterized by muscle stiffness and spasms. It is commonly found in soil, dust, and animal feces. The bacteria produce a potent toxin called tetanospasmin, which affects the nervous system and can lead to severe complications if not treated promptly. Tetanus is often associated with deep puncture wounds, especially those contaminated with dirt or feces. Vaccination with the tetanus vaccine is crucial for prevention, as it helps the body build immunity against the toxin. Proper wound care and hygiene are also important in reducing the risk of infection.