How long does a tetanus shot last?

Written by Zhang Da Wei
General Surgery
Updated on May 19, 2025
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Tetanus bacillus is relatively common in daily life. Once an infection of this kind occurs, or is suspected, a tetanus vaccine must be administered. The effectiveness of the tetanus vaccine lasts about a week. After this period, it no longer has any special therapeutic effects. This means that administering the vaccine during the onset of the disease can only temporarily help with prevention. If similar infections occur in the future, the vaccine should be administered again. Although the effective period of the tetanus vaccine is very short, as long as it is administered promptly when there is a risk, its safety is still relatively high and it can provide better prevention.

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Written by Xu Jun Hui
General Surgery
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Which department should I go to at the hospital for a tetanus shot?

Tetanus shots should be administered at a regular hospital in the emergency department. There are two types of tetanus injections: one that requires a skin test, called tetanus toxoid, and one that doesn't require a skin test, called tetanus immunoglobulin. It is generally recommended to get the tetanus shot within 24 hours of injury, and it is best to avoid alcohol before the injection. Drinking can cause dilation and reddening of the skin's capillaries, which can affect the results of the tetanus skin test. Tetanus is usually caused by the invasion of Clostridium tetani into the body, a type of anaerobic bacterium. Thus, for wounds that are small, deep, and heavily contaminated, such as with dirt, rust, or in cases of open fractures, anti-tetanus treatment is essential, and a tetanus shot can be administered in the hospital's emergency department.

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Written by Xu Jun Hui
General Surgery
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When to get a tetanus shot?

Tetanus is caused by the invasion of the body by tetanus bacillus, a type of anaerobic bacterium that generally thrives in anoxic environments or heavily contaminated wounds such as those exposed to polluted soil or rust. Therefore, if the wound is deep, is in an anoxic environment, or is severely contaminated with soil, rust, or is an open fracture with expanded area, explosive injury, gunshot wound, or animal bite, tetanus treatment is required. Tetanus injections include tetanus toxoid, which requires a skin test, and tetanus immunoglobulin, which does not require a skin test, with an injection generally recommended within 24 hours.

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Written by Xu Jun Hui
General Surgery
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How many tetanus shots are administered?

A tetanus shot is sufficient; tetanus treatment can be divided into tetanus toxoid, which requires a skin test, and tetanus immunoglobulin, which does not require a skin test. The tetanus bacillus is commonly found in anaerobic wounds and heavily contaminated wounds, such as those contaminated with soil and rust etc., which can lead to colonization of tetanus bacilli on human mucous membranes and invasion of the body, producing toxins that affect the jaw muscles and respiratory muscles, causing difficulty in breathing and, in severe cases, endangering life. Therefore, for patients who need antitetanus treatment, it is imperative to undergo such treatment, generally with just one injection.

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Written by Zhang Da Wei
General Surgery
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How many times can a tetanus shot be administered in a year?

The tetanus toxin vaccine is used for emergency vaccination. The main ingredient of this vaccine is the tetanus antitoxin. It is best to be vaccinated within 24 hours, and the sooner the vaccination is administered, the stronger the potential for protection. However, the duration of protection provided by the vaccine is not very long, and the effect of the tetanus antitoxin medication generally lasts about a week. Therefore, vaccination within 24 hours can effectively prevent problems that may occur within that week. Generally, there is no specific number for the annual frequency, but it is usually recommended not to exceed three times per year. Of course, this depends on the degree of injury. If there is a risk of infection, then the vaccine should be administered since its preventive effect is currently considered the best and can achieve significant efficacy.

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Written by Gao Sen
General Surgery
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How deep must a nail puncture be to require a tetanus shot?

Tetanus is a specific infection caused by the invasion of Clostridium tetani through skin or mucosal wounds, leading to muscle spasms. Tetanus mainly causes damage to the respiratory tract, digestive system, and cardiovascular system. If not treated promptly, it can lead to suffocation, respiratory failure, and endanger life. Tetanus is preventable; in cases of open wounds at risk of tetanus infection, tetanus antitoxin should be administered for emergency prevention. Tetanus is widely present in feces and soil and can invade the human body through dust or direct contamination of wounds, leading to infection. Wounds that are small, deep, or heavily contaminated all require preventive tetanus vaccinations.