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Tetanus is an acute infectious disease caused by toxins produced by the bacterium Clostridium tetani. These toxins attack the central nervous system, leading to rigidity and spasms of voluntary muscles, most notably the jaw, earning it the nickname "lockjaw." The spores of Clostridium tetani are found in soil and can enter the body through any wound, with puncture wounds and deep lacerations being particularly dangerous due to the oxygen-free environment they provide for bacterial growth.1

Tetanus antitoxin is an antibody that neutralizes the tetanus toxin in the bloodstream. It is produced by injecting animals, typically horses, with the toxin, allowing their bodies to develop a high concentration of antitoxins. This preparation, called an antiserum, is then used to treat tetanus. While antitoxin helps neutralize circulating toxin, it has limited effect once the toxin has reached nerve endings. Intravenous penicillin is used to kill any remaining bacteria in the wound.21

Active immunization with tetanus toxoid, a modified form of the toxin, stimulates the body's own defenses to build immunity over time and requires booster doses every few years.3

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