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 Ai Bing Quan
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Tetanus vaccination is effective if administered within a few days.

A tetanus shot is best administered within 24 hours after injury, and it is still effective if given within 48 hours. If not feasible, the injection can be administered within a week. Tetanus is caused by an infection with tetanus bacillus and is usually very severe. The incubation period for tetanus bacillus is about one week, hence, tetanus antitoxin should be administered as soon as possible after injury to prevent infection. If a tetanus antitoxin skin test is positive, tetanus immunoglobulin can be administered for immunologic skin testing. Symptoms of tetanus, when they appear, mainly include trismus, a forced grin, throat swelling, choking, opisthotonus, etc. If not promptly treated, these symptoms can lead to death.

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Do you still need a skin test for tetanus allergy?

Under normal circumstances, if there is an allergy to tetanus, a skin test is not required. If tetanus vaccination is indeed necessary, human immunoglobulin can be injected, and this does not require a skin test. 250 units can be injected directly. Additionally, tetanus antitoxin desensitization injections can be used. The so-called desensitization injection involves diluting 1500 units of tetanus antitoxin into doses of 0.1 ml, 0.2 ml, 0.3 ml, and 0.4 ml, totaling 1 ml, and administering it in four doses, each 20 minutes apart. After the injections are completed, an observation period of 30 minutes is required to ensure there are no adverse reactions before the patient can leave.

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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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How long does a tetanus shot last?

The duration of effectiveness for a tetanus shot depends on the specific type of injection used, as different injections vary in their duration of protection. Generally, the protection lasts about two to three days. In cases of infection, it is usually necessary to administer the vaccine within 24 hours. Under these circumstances, a period of about two to three days can be used to clean the wound, thereby achieving the best preventive effect. Additionally, there are other vaccines that are ten to twenty times more effective than this type of vaccine, with a typical prevention time ranging up to 15 days or even about a month. Of course, after receiving the tetanus vaccine, it is important to monitor for any allergic reactions, as different injections may vary in their degree of allergenicity, and individual reactions can differ based on personal health conditions.

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What is tetanus used for?

Tetanus is a disease caused by the invasion of Clostridium tetani through skin and mucous membrane wounds into the human body. It reproduces and produces toxins in an anaerobic environment, leading to a specific type of infection. Tetanus toxin mainly attacks the motor neurons, causing clinical symptoms such as episodic spasms, lockjaw, and rigid spasms. It mainly affects the masseter muscle, abdominal muscles, spinal muscles, etc., and can be life-threatening if not treated promptly. If the wound is heavily contaminated, deep, or contaminated with soil and rust, timely anti-tetanus symptomatic treatment should be administered.