Tetanus is the entry of Clostridium tetani into the body through the body’s broken places, and its common carriers include sharp sharp objects, kitchen knives, iron nails, dirt, etc. When the bacteria enter the body, because they are anaerobic bacteria, they can easily multiply in the closed body cavity, and when they proliferate in large quantities, they will release many toxins and reach all parts of the body with the blood flow, such as muscles and spinal cord, causing tonic contraction of the muscles of the whole body and manifesting Symptoms include a bitter smile, corneal regurgitation, difficulty in breathing, etc. Therefore, if the wound is superficial and clean, it may not be injected after debridement. However, if the wound is large and deep, and the contamination is serious, tetanus is needed, and it is best to do it within 24 hours after the injury for the best effect.