When to get a tetanus shot

Written by Tang Da Wei

General Surgery

Updated on February 24, 2025

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A tetanus shot is generally recommended to be administered immediately after an injury for the best efficacy. If given within 12 or 24 hours, it still provides certain preventive effects. The tetanus shot mainly consists of tetanus antitoxin and represents passive immunization. It is usually advised in cases of deep wounds with small surface areas that can create anaerobic conditions inside. If tetanus bacillus is present in the wound and proliferates massively under anaerobic conditions, the patient may exhibit symptoms such as opisthotonos, asphyxiation, or even death. Therefore, it is necessary to administer tetanus antitoxin for prevention.

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What are the complications of tetanus?

The main complications of tetanus primarily include suffocation, atelectasis, and pulmonary infections. Patients with severe conditions should have a tracheotomy performed as soon as possible to improve ventilation and clear the respiratory tract secretions. At the same time, artificial assisted breathing can be conducted, and hyperbaric oxygen therapy can be used as an adjunctive treatment. Care during tracheotomy should focus on airway management, including airway nebulization, humidification, flushing, and prevention of pressure sores, utilizing strict aseptic techniques to prevent cross-infection and subsequent pulmonary infections. Antibiotics should be selected based on the type of bacteria, and dedicated personnel should be assigned for nursing to prevent injuries from biting the tongue.

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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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Is tetanus an anaerobic bacterium?

Tetanus is a specific infection often associated with trauma. In addition to various traumas, it can also occur in parturient women and newborns under unsanitary conditions. The pathogen is Clostridium tetani, an obligate anaerobe that stains positive under Gram staining conditions. Normally present in the intestines of humans and animals, it is distributed in nature and common in soil. This type of bacteria has strong resistance to environmental conditions and can withstand boiling.

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Do you need a tetanus shot for a scrape?

Whether tetanus vaccination is necessary for an abrasion depends on the severity of the injury. For a minor abrasion where the wound is not deep, you can repeatedly rinse the wound with hydrogen peroxide or saline solution to wash off contaminants. After that, disinfect with iodine and perform simple bandaging. Change the dressing as needed. Such abrasions do not require a tetanus shot. However, if the abrasion is severe, the wound is deep, heavily contaminated, or caused by rusty metal, it is essential to receive tetanus vaccination while cleaning the wound in the hospital to prevent tetanus.

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Will a scrape lead to tetanus?

When a tetanus infection occurs, the wound is generally quite deep, for instance, reaching the subcutaneous fat or even the muscle layer in severe cases. Such deep wounds can create an anaerobic environment, which is conducive for the growth and reproduction of Clostridium tetani, an anaerobic bacterium. This bacterium produces exotoxins, primarily the tetanospasmin, which causes the associated clinical symptoms in patients. If it's merely a scrape or a superficial wound, tetanus infection is unlikely. Clinically, what is needed for such abrasions is to disinfect the area with iodine and then bandage it appropriately.