Logan Reed
Vaccines are safe and crucial to preventing disease, but they can cause allergic reactions in some people. These allergic reactions can range from mild to severe, with anaphylaxis being the most serious type of allergic reaction. Anaphylaxis is a rare, life-threatening allergic reaction that can be caused by the vaccine antigen or other components of the vaccine. Symptoms include hives, throat tightness, difficulty breathing, dangerously low blood pressure, and loss of consciousness. Other milder allergic reactions may include pain, tenderness, swelling, redness at the injection site, fever, rash, headache, fatigue, nausea, and dizziness. These reactions are typically harmless and can be treated with over-the-counter medications like ibuprofen or acetaminophen, and cold compresses.
| Characteristics | Values |
|---|---|
| Type | Mild or severe allergic reaction |
| Reaction Time | Within 20 minutes to 4 hours |
| Symptoms | Hives, throat tightness, dangerously low blood pressure, difficulty breathing, generalized urticaria, angioedema, swelling, redness, fever, chills, tiredness, muscle aches, headaches, decreased appetite, nausea, dizziness, increased sleep, pain, tenderness, rash |
| Treatment | Mild reactions may resolve without treatment or with antihistamines like diphenhydramine. Severe allergic reactions are medical emergencies and require immediate resuscitation |
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What You'll Learn
Anaphylaxis: a rare, severe allergic reaction
Anaphylaxis is a rare, severe allergic reaction that can occur in response to vaccines. It is a life-threatening condition that requires immediate medical attention and treatment. Anaphylaxis typically occurs within minutes to hours after exposure to an allergen, with symptoms ranging from mild to severe.
The symptoms of anaphylaxis can include generalised urticaria (hives), angioedema, difficulty breathing, and low blood pressure. These symptoms can be more challenging to recognise in infants, toddlers, people with cognitive impairments, or those on sedative medications. Anaphylaxis occurs when the body's immune system overreacts to an allergen, such as an ingredient in a vaccine. The allergic reaction can be caused by the vaccine antigen or other components such as animal protein, antibiotics, preservatives, or stabilisers.
The rate of anaphylaxis is approximately 1 per million vaccine doses, according to reports. However, it is important to note that severe allergic reactions to vaccines are very rare. In the case of the Pfizer-BioNTech COVID-19 vaccine, 21 cases of anaphylaxis were reported out of 1,893,360 first doses administered, translating to 11.1 cases per million doses.
If anaphylaxis is suspected, immediate medical intervention is necessary. Epinephrine should be administered as soon as possible, and emergency medical services should be contacted. It is crucial to ensure the patient's airway, breathing, circulation, and level of consciousness are monitored and stabilised. The patient should be transported to a medical facility for further observation and treatment.
While anaphylaxis is a rare occurrence, it is essential to be prepared for such a reaction at vaccination sites. Appropriate medical treatment and supplies to manage anaphylaxis should be readily available, and post-vaccination observation periods should be implemented to monitor for any signs or symptoms of an allergic reaction.
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Mild reactions: redness, swelling, drowsiness
Mild allergic reactions to vaccines are relatively common and may include redness, swelling, and drowsiness. These symptoms typically manifest within the first 12 to 24 hours after receiving the vaccine and usually last between 2 to 5 days.
Redness and swelling often occur at the injection site, indicating a normal inflammatory response as the body's immune system activates and generates new antibodies. This localised reaction may also be accompanied by pain, tenderness, warmth, or soreness, which can be managed through gentle massage, application of heat or cold, and, if needed, acetaminophen.
Drowsiness, or increased sleep, is another potential mild reaction to vaccines. It is generally considered harmless and typically resolves within 24 to 48 hours. However, it is important to monitor for any additional symptoms or prolonged drowsiness, as this may indicate a more severe reaction.
While these mild reactions are common and typically resolve on their own or with simple interventions, it is always advisable to consult a healthcare provider if there are any concerns or if symptoms persist or worsen. Additionally, individuals should inform their healthcare provider if they have previously experienced allergic reactions to vaccines or their components, as this information is crucial for personalized advice and future vaccine administrations.
It is important to note that severe allergic reactions, such as anaphylaxis, are very rare, affecting approximately 1 in 1 million vaccine doses. These reactions typically occur within 4 hours of vaccination and may involve multiple body systems, including hives, angioedema, difficulty breathing, and low blood pressure. Immediate medical attention is required for anaphylaxis, and subsequent doses of the vaccine should be avoided until allergy testing is performed under medical supervision.
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Severe reactions: hives, throat tightness, low blood pressure
Severe allergic reactions to vaccines are very rare but can be life-threatening. Anaphylaxis is a rare but serious type of allergic reaction that can occur after any vaccine. Anaphylaxis can cause hives, which are characterised by wheals accompanied by an itching or burning sensation that generally resolves within 24 hours. Hives may also be referred to as urticaria, which is characterised by wheals and is a symptom of acute-onset IgE-mediated hypersensitivity.
Anaphylaxis can require immediate treatment with epinephrine (EpiPen) and may require hospitalisation. Symptoms of anaphylaxis include wheezing, difficulty breathing, and low blood pressure. Low blood pressure is also known as hypotension, which is a symptom of anaphylaxis specifically following rabies and Japanese encephalitis vaccines.
Throat tightness, or difficulty breathing, is another symptom of anaphylaxis. Other symptoms of anaphylaxis include vomiting, diarrhoea, decreased level of consciousness, and shock. Symptoms of anaphylaxis can progress rapidly and require immediate treatment.
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Non-allergic reactions: fever, chills, muscle aches
While allergic reactions to vaccines are rare, non-allergic reactions are common. These reactions mean the vaccine is working, and your body is making new antibodies to protect against the real disease.
Fever, chills, and muscle aches are some of the most frequently reported non-allergic reactions to vaccines. Fever is a common side effect of many vaccines, including the influenza vaccine, the MMR vaccine, and the COVID-19 vaccine. It usually begins within 24 hours of vaccination and lasts 1 to 2 days. In some cases, such as with the MMR vaccine, fever may be delayed and start between 1 and 4 weeks after vaccination.
Chills are another possible non-allergic reaction to vaccines. They are often reported in conjunction with fever and may be accompanied by muscle aches and headaches. These symptoms typically start about 24 hours after vaccination and usually last 1 to 2 days.
Muscle aches, or myalgia, are also a commonly reported side effect of vaccines, particularly the influenza vaccine and the COVID-19 vaccine. They can be caused by a cross-reaction of the immune system against the vaccine and skeletal muscle. In some cases, muscle aches may be accompanied by elevated levels of creatine kinase (CK) and myoglobin. While these symptoms typically resolve within a few days, they can sometimes persist for weeks.
It is important to note that while these non-allergic reactions are typically mild and short-lived, they can be uncomfortable and impact daily activities. If you experience any of these symptoms after vaccination, it is recommended to monitor your condition and seek medical advice if necessary.
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Allergic reaction causes: vaccine antigen, vaccine components
Vaccines contain an active component (the antigen) and additional components. Vaccine antigens can comprise whole organisms or parts of organisms, inactivated toxins (toxoids), or both, that induce protective immune responses.
Vaccine antigens rarely cause hypersensitivity reactions. Rather, hypersensitivity reactions after vaccination are usually due to individual vaccine components, such as egg protein, gelatin, and potentially other additives. The most immediate reactions are Type I hypersensitivity reactions mediated by the interaction of IgE antibodies against a particular vaccine component.
Almost all vaccine components can be considered potential triggers of an allergic reaction. Culture-derived proteins from egg, gelatin, and yeast are of particular importance. Other sources of allergic reactions are antibiotics and vaccination antigens.
Some vaccines that contain egg protein include the injectable influenza vaccine and the MMR vaccine. Egg allergy is the most frequent food allergy among children, and sensitization reactions occur most frequently before the age of five. However, numerous studies have demonstrated that the injectable influenza vaccine can be safely administered to patients with severe egg allergies, as the current influenza vaccines contain only trace amounts of egg protein.
Gelatin of either bovine or porcine origin is added to both live and inactivated vaccines as a stabilizing agent. In the United States, there have been reports of anaphylactic reactions to the MMR vaccine among patients with antibodies to gelatin. In Japan, after the introduction of vaccines not containing gelatin, the incidence of allergic reactions declined sharply.
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Frequently asked questions
Allergic reactions to vaccines can range from mild to severe. Mild allergic reactions may include hives, a rash, or redness at the injection site. More severe allergic reactions, such as anaphylaxis, may include symptoms such as throat tightness, difficulty breathing, dangerously low blood pressure, and a feeling like your throat is closing. Anaphylaxis is considered a medical emergency and requires immediate treatment.
Severe allergic reactions to vaccines are very rare, occurring in about 1 out of every million doses. However, mild allergic reactions are more common and can often be treated with antihistamines.
If you experience a mild allergic reaction, you may be able to treat it with antihistamines like diphenhydramine. However, if you are having a severe allergic reaction, such as anaphylaxis, it is important to seek immediate medical attention by calling for emergency services.
