
The tetanus vaccine is a recommended immunization for both children and adults. It protects against tetanus, a serious and often fatal bacterial infection. The vaccine is generally safe and effective, but like most vaccines, it can cause side effects. One of the most common side effects of the tetanus vaccine is a mild fever of up to 100.4°F (38°C). However, in rare cases, higher fevers may occur as a moderate side effect. It is important to monitor your symptoms and seek medical attention if they worsen or persist.
| Characteristics | Values |
|---|---|
| Fever | Mild fever of up to 100.4ºF (38ºC) is common. More severe fevers, such as over 102.2 F, are rare but concerning. |
| Pain | Mild to moderate pain at the injection site is common. |
| Redness | Redness at the injection site is common. |
| Swelling | Swelling at the injection site is common. Facial swelling is a rare allergic reaction. |
| Headache | Mild to moderate headaches are common. |
| Body aches | Muscle pain and body aches are common. |
| Tiredness | Feeling tired or drowsy is common. |
| Loss of appetite | Loss of appetite can occur. |
| Nausea | Mild nausea is common. |
| Vomiting | Vomiting can occur. |
| Diarrhea | Diarrhea can occur. |
| Allergic reaction | Allergic reactions are rare but possible, and can be severe. |
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What You'll Learn

Fever and other side effects
The tetanus vaccine is generally considered safe and is recommended for people of all ages. It is an effective combatant against tetanus infection, a serious and often fatal bacterial disease. The vaccine activates your immune system to produce antibodies that fight the bacteria.
Like most vaccines, the tetanus vaccine does have some side effects, which are usually mild and short-lived. A fever is one of the possible side effects of the tetanus vaccine. It is quite normal to experience a mild fever after the vaccination, and it should go away within a day or so. A fever is a sign that your body is working hard to build up immunity. However, a high fever (over 102.2°F or 38°C) is a cause for concern and may indicate a moderate side effect.
Other common side effects of the tetanus vaccine include pain, redness, or swelling at the injection site. This usually subsides within a few days. You may also experience a headache, body aches, nausea, vomiting, or diarrhea. These side effects are typically mild and can be relieved with over-the-counter medications such as acetaminophen or ibuprofen. Feeling tired or drowsy after the vaccination is also common.
Serious side effects from the tetanus vaccine are very rare. However, in rare cases, it may cause a severe allergic reaction, which can lead to facial swelling and difficulty breathing. If you experience any severe or persistent symptoms after receiving the tetanus vaccine, seek immediate medical attention.
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Fever severity and treatment
A fever is a common side effect of the tetanus vaccine. It is usually mild, reaching a maximum of 100.4° F (38° C). Such fevers typically go away within a day and can be treated with over-the-counter medications such as ibuprofen or acetaminophen.
Fever severity is classified based on body temperature. A body temperature of 100.4° F (38° C) or higher is considered a fever. Fevers can be further classified as:
- Low-grade: 100.4 to 102.4° F (38 to 39.1° C)
- High-grade: 102.4 to 105.8° F (39.1 to 41° C)
While fever by itself is usually harmless, high fevers can be dangerous. Fevers below 104° F (40° C) are generally not harmful and may even help the immune system fight certain infections. However, a fever above 104° F (40° C) is a cause for concern and requires immediate medical attention.
In children, a fever lasting more than three to five days requires medical attention. Additionally, a fever of 104° F (40° C) or higher in children is an emergency and requires immediate medical care.
To treat a fever, the following steps can be taken:
- Drink plenty of fluids to prevent dehydration.
- Eat light and easily digestible foods.
- Get adequate rest.
- Take medications such as ibuprofen or acetaminophen to relieve aches and reduce temperature.
- Take a lukewarm bath or apply damp washcloths to the forehead and wrists.
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Fever as a sign of allergic reaction
A fever is a common side effect of the tetanus vaccine. It is usually mild, reaching up to 100.4ºF (38ºC), and it goes away within a day or so. However, a fever higher than 102.2ºF is a cause for concern and is considered a moderate side effect of the vaccine.
While allergies can cause a fever, it is not a direct consequence. Allergies occur when the body's immune system overreacts to certain substances, treating them as threats. This immune response can weaken the body, making it more susceptible to other illnesses that cause fever. For example, untreated allergies can lead to serious sinus infections, which are caused by bacteria or viruses and can result in a fever.
Hay fever, also called allergic rhinitis, does not cause a fever. It is characterised by symptoms such as a runny or stuffy nose and an itchy mouth, eyes, or skin. Seasonal allergic rhinitis is typically triggered by airborne mold spores and pollen from trees, grasses, and other plants.
In rare cases, the tetanus vaccine can cause an allergic reaction. Serious allergic reactions typically occur within a few minutes to a few hours after vaccination. Symptoms of an allergic reaction include facial swelling, hives, itching, and difficulty breathing. If you experience any of these symptoms after receiving the tetanus vaccine, seek immediate medical attention.
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Fever and other symptoms in children
The tetanus vaccine is generally safe for most people, and adverse reactions are rare. However, it can cause mild fever in both adults and children. A fever is a common sign that the body is building immunity against the disease. In most cases, the fever should subside within a day or so. Over-the-counter medications such as acetaminophen (Tylenol) or ibuprofen can help in reducing the fever.
Serious side effects in children are rare, but they can occur. If your child experiences a fever of over 105 degrees Fahrenheit (40 degrees Celsius), it is considered a severe reaction, and you should seek immediate medical attention. Other severe side effects that require immediate medical care include continued inconsolable crying (usually for more than a few hours), seizures, swelling of an entire arm or leg, severe allergic reactions, difficulty breathing, swelling of the face, lips, tongue, or throat, hives, and vomiting.
The tetanus vaccine is highly recommended for children and is typically given in a series of shots starting from infancy to boost their protection against tetanus. The specific vaccine formulation and schedule may vary depending on the child's age and previous vaccinations. The DTaP vaccine, which protects against tetanus, diphtheria, and pertussis (whooping cough), is recommended for children under the age of seven years old. The recommended schedule for DTaP vaccination is at 2, 4, and 6 months, and then between 15 and 18 months. A booster shot is recommended for children between the ages of 4 and 6 years old.
In addition to fever, children may experience other mild side effects after receiving the tetanus vaccine. These can include pain, redness, or swelling at the injection site, headache, body aches, nausea, and fatigue. These side effects are generally not a cause for concern and usually subside within a few days. However, if the injection site is bleeding or the pain, redness, or swelling is severe enough to interfere with the child's usual activities, it is recommended to contact your doctor.
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Preventing fever and other side effects
The tetanus vaccine is a recommended immunization for children and adults. It protects against tetanus, also known as lockjaw, a serious and often fatal bacterial infection. The vaccine contains a weakened version of the toxin produced by Clostridium tetani, the bacteria that cause tetanus. While the vaccine is generally safe, it can occasionally cause mild to severe reactions.
Mild fever is a common side effect of the tetanus vaccine, affecting up to 1 in 10 adults. To prevent or manage fever, you can take over-the-counter (OTC) medications such as acetaminophen (Tylenol) or ibuprofen. These medications can also help alleviate other common side effects like headaches, body aches, and pain at the injection site. It is important to note that these side effects are typically mild and temporary, lasting only a few days.
To minimize discomfort and potential side effects, it is recommended to take the following precautions:
- Consult your healthcare provider before vaccination: Discuss your medical history, including any allergies or reactions to previous vaccinations. Your healthcare provider can advise you on whether it is safe to proceed and offer alternative options if necessary.
- Follow the recommended vaccination schedule: For children, this typically involves a series of shots starting at 2 months of age, with boosters every 10 years thereafter. Adults should also ensure they are up to date with their tetanus boosters, especially if they sustain deep wounds or cuts.
- Stay hydrated and rest: Drinking plenty of fluids and getting adequate rest can help your body recover from any mild side effects, such as nausea, vomiting, or diarrhea, which may occur with the Tdap vaccine.
- Avoid certain medications: Consult your doctor or pharmacist about any medications you are currently taking. Certain drugs may interact with the vaccine, increasing the risk of side effects. Adjusting the dosage or timing of medication intake may be necessary.
- Monitor for severe reactions: Although rare, severe allergic reactions can occur within a few minutes to hours after vaccination. Seek immediate medical attention if you experience difficulty breathing, swelling of the face or throat, rapid heartbeat, dizziness, or anaphylaxis.
It is important to remember that the benefits of the tetanus vaccine greatly outweigh the risks of potential side effects. The vaccine has made tetanus a preventable disease, significantly reducing the occurrence of lockjaw and its associated complications.
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Frequently asked questions
Yes, a fever is a common side effect of the tetanus vaccine. This is usually mild and should go away within a day or so.
Other common side effects include pain, redness, and swelling at the injection site. Some people also experience headaches, nausea, fatigue, and body aches.
Severe side effects are very rare. However, in rare cases, the vaccine can cause a severe allergic reaction, so seek immediate medical attention if you experience any unusual symptoms.
The tetanus vaccine is highly effective in preventing tetanus, a serious and often fatal bacterial infection. It is recommended for both children and adults as part of routine immunizations.
Yes, there are several types of tetanus vaccines, including DTaP, Tdap, DT, and Td. The type of vaccine given depends on the age of the person being vaccinated and their medical history.

































