Tetanus shot refers to the tetanus antitoxin, which is a form of passive immunity. This means that when a patient suffers from external injuries, such as wounds on the feet or hands, the drug injected to prevent infection by tetanus bacillus inside the wound is tetanus antitoxin. It generally maintains its effect in the patient's body for about a week. If the patient's wound inflammation is severe and there is a suspicion of tetanus infection, it is necessary to clean the wound. If required, another injection of tetanus antitoxin might be needed after a week. On the other hand, getting the tetanus vaccine, which is an active immunity, usually involves the DTP vaccine and generally lasts about ten years.