Tetanus can be given for more than 3 days, but the effect is poor. After having a trauma with suspected tetanus infection, it is recommended that tetanus antitoxin be given promptly within 24 hours. Tetanus is caused by Clostridium tetani, which enters the body through various wounds and multiplies to produce toxins and cause various symptoms of infection. Symptoms do not appear immediately after tetanus infection, but go through an incubation period of about 3 days at the shortest. The mortality rate of tetanus attack is very high, so once tetanus infection is suspected, it is recommended that tetanus antitoxin be injected promptly within 24 hours; if it takes more than three days, it is very ineffective and difficult to achieve the preventive effect. Tetanus infection usually appears after the occurrence of traumatic injuries, such as being stabbed by nails and other wounds, the external opening is relatively small, and the wounds are deeper, it is recommended to consult a regular hospital for treatment.