How many years does the tetanus vaccine last?

Written by Zhang Peng
General Surgery
Updated on April 04, 2025
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Tetanus vaccines generally involve an active immunization process against tetanus with a complete immunization schedule, providing effective protection for up to ten years for those who have completed the full course of prevention.

Typically, newborns must receive three doses of the DTP (diphtheria, tetanus, pertussis) vaccine, with the first dose administered at three months of age, followed by a dose each subsequent month, and booster shots at eighteen months or six years of age. If vaccinated, no further tetanus antitoxin or tetanus immunoglobulin injections are required for injuries incurred within ten years of vaccination.

If no active immunization has been done and the wound is heavily contaminated, it is crucial to promptly administer tetanus antitoxin or tetanus immunoglobulin. A skin test must be performed before using tetanus antitoxin; if the test is strongly positive, immunoglobulin should be administered for preventive treatment.

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Written by Gao Sen
General Surgery
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The likelihood of a wound being infected with tetanus

Tetanus is a specific infection often associated with trauma, with a high contamination rate of tetanus bacillus in traumatic wounds. On the battlefield, the contamination rate can reach 25% to 80%, although the incidence of tetanus in contaminated wounds is only about 10% to 20%. This suggests that other factors are necessary for the disease to occur, with the main factor being an anaerobic environment. If the wound is deep, with a small external opening, and contains necrotic tissue, blood clots, or is too tightly packed, this can lead to local ischemia. Additionally, if there is a co-infection with aerobic bacteria consuming residual oxygen in the wound, it creates an anaerobic environment conducive to the growth of the bacteria, thus increasing the likelihood of tetanus infection in the wound.

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How long does it take for tetanus to develop?

Tetanus is a specific type of infection caused by the toxin produced by the growth and reproduction of Clostridium tetani, which enters the body through damaged skin and mucous membranes and thrives in an anaerobic environment. Clinically, it is mainly characterized by lockjaw, muscle rigidity, and muscle spasms. After being infected with tetanus, people generally show symptoms within seven to eight days; in quick cases, symptoms can appear within twenty-four hours, while in longer scenarios, the onset can take several months or even years.

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Written by Tang Da Wei
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What are the chances of getting tetanus?

In clinical practice, the chances of tetanus are relatively low. Tetanus is mainly caused by infection with the tetanus bacillus. Since the tetanus bacillus is an anaerobic bacterium and is found almost everywhere in nature, patients with injuries, especially small and deep wounds, are prone to tetanus infection. Therefore, for wounds with injuries, especially deep ones, it is important to promptly administer a tetanus shot to prevent infection. At the same time, thorough debridement of the wound is necessary to completely eliminate the tetanus bacillus from the wound. If prevention or proper wound cleaning is not effectively carried out, there is a potential risk of tetanus infection.

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Written by Zhang Peng
General Surgery
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How is tetanus diagnosed?

For the diagnosis of tetanus, it mainly relies on relevant medical history and clinical manifestations. In terms of laboratory diagnosis, most cases involve culture of Clostridium tetani from wound tissue or polymerase chain reaction testing. Generally, a positive result can confirm a diagnosis of tetanus, but a negative result does not rule it out. Most laboratories are unable to perform these tests, and even if tetanus antibodies reach a protective level, it does not exclude a diagnosis of tetanus. If the patient has a clear history of injury or animal bites, and presents with symptoms such as lockjaw, a sardonic smile, muscle rigidity, difficulty swallowing, or persistent spasms, tetanus should be considered promptly and relevant treatment initiated.

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Can tetanus be fatal?

Firstly, severe tetanus, if not treated in time, can be fatal. When infected with tetanus, the early symptoms mainly include dizziness, headache, fatigue, decreased appetite, weak chewing, soreness or cramping of the jaw muscles, or muscle tension. Of course, when tetanus is severe, it can manifest as difficulty opening the mouth, risus sardonicus, opisthotonos, and stiff neck. In severe cases, there may be difficulty breathing, respiratory arrest, and even cardiac arrest. If in this situation, we do not promptly carry out emergency treatment, the tetanus patient can die.