What situations require a tetanus shot?

Written by Li Jin Quan
General Surgery
Updated on April 27, 2025
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Usually, tetanus is caused by the toxin produced within the human body by Clostridium tetani, entering through broken skin or mucosa, leading to a specific type of infection. Tetanus is commonly found in our surroundings, such as in moist soil, rusty iron, or on bamboo sticks. When wounds are large, deep, severely contaminated, contain foreign bodies, or in cases of severe burns, scalds, or certain open fractures, it is crucial to seek timely vaccination at medical institutions.

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Written by Tang Da Wei
General Surgery
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Will a lacerated wound lead to tetanus?

Tetanus is usually caused by an infection with Clostridium tetani. As Clostridium tetani are anaerobic bacteria, they proliferate extensively in an oxygen-free environment. If a wound is small and shallow, and completely open to air, it is generally not susceptible to tetanus infection. However, if the wound is deep and the external opening is small, creating an anaerobic condition inside, it is easy to contract tetanus. Therefore, it is generally recommended to administer a tetanus antitoxin following an injury, as an internal infection with tetanus can lead to very serious conditions, potentially resulting in death.

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Written by Ai Bing Quan
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Where to get a tetanus shot?

Tetanus can be treated in any department, but generally, after an injury, one would first go to the emergency room. Therefore, tetanus is very common in emergency medicine. Tetanus is a type of anaerobic bacterium that is ubiquitous in nature. If a person has a wound that is small and deep, the internal environment can become anaerobic, which easily leads to rapid proliferation of tetanus. At this point, it is necessary to inject tetanus immunoglobulin into such wounds. It is best done within 24 hours because after a long period, the tetanus bacillus might have already proliferated in the wound. A skin test should be performed before the injection, and the injection can only proceed if the skin test is negative. If the wound is relatively large and severe, it generally will not be infected by tetanus bacillus.

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Written by Zhang Peng
General Surgery
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How many years does the tetanus vaccine last?

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 Liu Huan Huan
General Surgery
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Can you get tetanus from a plastic scratch?

In clinical practice, all injuries, if the wound is relatively deep, such as being cut by a sharp object into the subcutaneous tissue or even damaging the tendons, reaching the muscle tissue, can potentially be infected by tetanus. Wounds inflicted by plastic can also be infected by tetanus. In such deep wounds, Clostridium tetani can easily grow and reproduce. This bacterium can produce a toxin that causes muscle spasms, leading to related clinical symptoms. Therefore, if a plastic injury results in a deep wound, there is a risk of tetanus infection. It is advised that the patient seeks medical attention promptly, undergoes wound disinfection, and receives an injection of tetanus antitoxin to prevent infection.

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Written by Zhang Peng
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How long does the tetanus shot last?

The duration of the effectiveness of a tetanus shot depends on whether tetanus antitoxin or tetanus immunoglobulin is administered following a suspected tetanus infection. Both types are forms of artificial passive immunity, providing immediate specific immunity after injection, mainly for treatment or emergency prevention. The metabolism and immune duration of these two injections vary: generally, tetanus antitoxin lasts about seven days, while tetanus immunoglobulin can last up to three weeks. Therefore, the specific duration of the effectiveness of a tetanus shot must be determined based on the individual injection circumstances. For suspected tetanus infections, it is generally advised to administer the injection as soon as possible. It's not that the injection will be ineffective if administered after a certain time, but rather that effective prevention before the onset of the disease can still be beneficial.