Tetanus usually passes through the epidermal or mucosal wounds of the human body, invades the soft tissues of the human body, and produces toxins by breeding and reproducing inside, thus triggering the attack of tetanus. Tetanus bacillus is an anaerobic bacterium, which can easily multiply in small, deep wounds, but not superficial, superficial abrasions, so small, deep wounds, such as stab wounds with nails or knives, can be easily infected with tetanus. In addition, head trauma resulting in skull base fracture, such as nasal cavity, oral cavity and ear deep wounds, are also susceptible to tetanus infection, and anal or rectal trauma is also deeper wounds, also susceptible to tetanus infection.