Tetanus is a specific type of infection caused by the toxin produced by the growth and reproduction of Clostridium tetani, which enters the body through damaged skin and mucous membranes and thrives in an anaerobic environment. Clinically, it is mainly characterized by lockjaw, muscle rigidity, and muscle spasms. After being infected with tetanus, people generally show symptoms within seven to eight days; in quick cases, symptoms can appear within twenty-four hours, while in longer scenarios, the onset can take several months or even years.