How long does a tetanus shot last?

Written by Zhang Da Wei

General Surgery

Updated on December 01, 2024

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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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Written by Li Chang Yue

General Surgery

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Can a tetanus shot be administered again?

If a tetanus shot is administered within 24 to 48 hours after injury, it can effectively prevent tetanus. However, if the tetanus shot is given a week or more after the injury, the effectiveness and relevance of the booster are generally not ideal. In such cases, tetanus immunoglobulin can be used for comprehensive antibody therapy to treat and prevent tetanus. Therefore, when the body sustains external injuries or certain infectious foci, it is crucial to promptly administer a tetanus shot intramuscularly, ideally within 24 hours, to effectively stimulate the body to produce the corresponding antibodies for protection.

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General Surgery

55sec

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How long is a tetanus shot effective?

It is definitely better to get a tetanus shot as soon as possible, ideally within 24 hours after injury, as the chance of prevention is much higher compared to other times. Once an injury occurs, it is essential to go to a formal hospital for wound treatment, and then use disinfectant products, typically hydrogen peroxide or iodophor, to assist in disinfection. Generally, for open wounds, stitching may be necessary, but such wounds should generally not be bandaged because bandaging can lead to anaerobic bacterial infection. Since the incubation period for Clostridium tetani, the bacterium that causes tetanus, is five to seven days, an infection could potentially develop during this time. Therefore, it is advisable to get vaccinated against tetanus infection within a week. If this timeframe is exceeded, it might impact the effectiveness of the preventative measure, thus rendering it significantly less meaningful.

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Written by Zhang Peng

General Surgery

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How many times do you need to get a tetanus shot?

The number of tetanus shots required depends on the specific condition of the wound and the patient's previous immunization history. Generally, for smaller, superficial, and cleaner wounds, which are considered to have a low risk of tetanus infection, the body can produce protective antibodies on its own. In such cases, a tetanus toxoid injection is given once a month, usually three times in total, allowing the patient's body to produce active antibodies and obtain long-term protection. If the wound is large, deep, and contaminated, with a substantial amount of foreign material or necrotic tissue, the chances of tetanus infection are very high. In such cases, passive immunization is actively conducted, usually involving tetanus antitoxin or immunoglobulin. Here, typically three doses of tetanus toxoid are administered to stimulate the body to produce active antibodies and achieve long-term protection.

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General Surgery

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Can tetanus be fatal?

Tetanus can be fatal if not treated promptly. When infected with tetanus, early symptoms primarily include dizziness, headache, fatigue, decreased appetite, weak chewing, and sore jaw muscles, some may also exhibit increased reflexes or muscle rigidity. As the condition worsens, some patients show typical tetanus symptoms such as lockjaw, difficulty opening the mouth, risus sardonicus, opisthotonos, and stiff neck. As the condition further deteriorates, it can lead to difficulty breathing, or even respiratory arrest, and cardiac arrest. If not promptly rescued, the patient can die.

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Emergency Surgery

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Initial symptoms of tetanus

The bacterium that causes tetanus is Clostridium tetani, which is an anaerobic bacterium. If the wound is deep and enclosed in an environment lacking oxygen, it creates a suitable environment for the growth and reproduction of Clostridium tetani. Its incubation period is generally around one week. Early symptoms may include general fatigue, localized muscle tension, and uncontrollable spasms. The first muscles affected are usually the facial chewing muscles, and it can then progress to intense, spasmodic contractions of muscles throughout the body, and even cause fractures. Mild stimuli such as light, sound, or drinking water can trigger and worsen these symptoms, somewhat similar to rabies. However, a characteristic feature of tetanus is that the patient remains mentally clear. Most patients may die from respiratory spasms leading to asphyxiation, heart failure, or lung infections.