The tetanus shot should be administered within 24 hours after the injury, and it is best not to exceed 72 hours, as this may affect the effectiveness.

Tetanus is usually caused by specific infection with Clostridium tetani, and symptoms such as muscle tension or generalized spasms may occur after infection. The tetanus shot can stimulate the body to produce antibodies, preventing the onset of symptoms. Generally, there is an incubation period of 3 to 20 days after infection. If the shot is administered more than 24 hours after infection, it can still have a certain preventive effect, but the sooner the injection is given, the better the effect. If the wound is deep, it is necessary to receive a tetanus shot after the wound is debrided by a professional doctor.

Patients should observe for allergic reactions after receiving a tetanus shot, and avoid bathing within 24 hours after injection to prevent infection from water contacting the wound.