Reactions Following Measles Vaccination

Apr 25, 2022 Source: Cainiu Health

Dr. Gan Liqiang

Introduction

The measles vaccine is a live attenuated vaccine that stimulates the body to develop immunity against the measles virus and is used to prevent measles. Adverse reactions following measles vaccination may include pain at the injection site within 24 hours post-vaccination. This typically requires no specific treatment and usually resolves spontaneously within 1–2 days. If fever exceeds 38.5°C, antipyretic medication may be administered.

The measles vaccine is a live attenuated vaccine. After administration, it stimulates the body to develop immunity against the measles virus and thereby prevents measles infection. Immediately following vaccination, some adverse reactions may occur. What are the common reactions after measles vaccination?

Reactions Following Measles Vaccination

The measles vaccine is a live attenuated vaccine that induces immunity against the measles virus and is used for measles prevention. Adverse reactions following measles vaccination may include localized pain at the injection site within 24 hours post-vaccination. This typically requires no specific treatment and usually resolves spontaneously within 1–2 days. Some individuals may experience mild fever 1–2 weeks after vaccination; this generally subsides on its own within 1–2 days and does not require treatment. If fever exceeds 38.5°C, antipyretic medication may be administered.

A transient rash may appear in a small number of children approximately one week after vaccination; this usually does not require specific treatment. However, if persistent fever, non-resolving rash, or anaphylactic shock occurs, prompt medical evaluation at a hospital is essential.

After vaccination, closely monitor your child’s condition. Avoid strenuous physical activity and ensure adequate rest. Encourage consumption of fresh fruits and vegetables, and avoid spicy or irritating foods for a short period following vaccination. We hope this information is helpful to you!

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The measles-rubella vaccine refers to the combined live attenuated measles and rubella vaccine. Fever usually means elevated body temperature. Fever following the combined measles and rubella live attenuated vaccine generally lasts no more than approximately 8 days and varies depending on individual physical condition. Individuals with better constitutions may experience a shorter duration of fever, while those with weaker constitutions may have a longer duration, but it typically does not exceed about 8 days.

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How long should the interval be between measles vaccinations?

Under normal circumstances, the full name of the measles vaccine is "measles attenuated live vaccine," and "打" refers to vaccination. The measles attenuated live vaccine is generally administered once every 10 months. When receiving the vaccine, it is important to ensure that the recipient does not have any contraindications such as fever, cough, or diarrhea, and to carefully monitor any reactions after vaccination. If any abnormalities occur, seek medical attention promptly and inform the doctor of the vaccination history.

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How long after receiving the measles vaccine does fever usually occur?

Fever in clinical terms refers to pyrexia, and the measles vaccine clinically refers to the measles attenuated live vaccine. It is not possible to directly determine how long after receiving the measles attenuated live vaccine fever may occur, because some individuals do not develop fever following vaccination. However, in individuals with poor physical condition, fever may appear 1 to 2 days after receiving the measles attenuated live vaccine.

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How many times should the measles vaccine be administered in a lifetime?

The measles vaccine is administered twice in a lifetime: the first dose is the measles-rubella (MR) vaccine, and the second is the measles vaccine; both contain the measles virus. The MR vaccine is a combined attenuated live vaccine containing both measles and rubella viruses. It is indicated for susceptible children aged 8 months or older who have not previously had measles. When administering the vaccine, note that 5%–10% of children may develop mild fever or a transient rash on days 5–6 after vaccination.

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What are the side effects of the measles vaccine?

Fever is a common and likely side effect following measles vaccination: The measles vaccine itself contains a weakened (attenuated) virus. Once introduced into the body, this virus triggers an immune response, which may cause transient physiological changes—including fever—in the vaccinated individual. This reaction reflects the normal interaction between the vaccine and the body’s immune system. As the immune system mounts a response and gradually adapts to the vaccine, the fever typically resolves on its own. If fever occurs after vaccination, there is generally no cause for concern.

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What should I do if my child develops a fever after receiving the measles vaccine?

Fever after receiving the measles vaccine is a normal phenomenon. If the body temperature exceeds 38.5°C, antipyretic treatment should be initiated promptly—ibuprofen or Anruike (acetaminophen) may be administered orally under a physician’s guidance. This helps prevent complications that may arise from excessively high fever. For temperatures below 38°C, physical cooling methods—such as wiping the body with lukewarm water or applying cold compresses—may be used.

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Adverse Reactions to Measles Vaccine

After receiving the measles vaccine, individuals may experience various adverse reactions, with fever being the most common. This clinical symptom typically occurs within 5–12 days following vaccination. If the fever remains below 38°C, standard physical cooling methods may be used. However, if the temperature exceeds 38.5°C, medical evaluation at a hospital is recommended to avoid delays in treatment.

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When should the measles vaccine be administered?

Measles is an acute, systemic, exanthematous infectious disease caused by the measles virus and is classified as a Category B notifiable infectious disease in China. The primary clinical manifestations of measles include Koplik’s spots (measles mucosal spots) in the oral cavity and maculopapular skin rash, accompanied by fever, cough, rhinorrhea (catarrhal symptoms), and conjunctivitis. The most effective method for preventing measles is vaccination with the measles vaccine. The measles vaccine contains a live attenuated measles virus propagated in chicken embryo cells.

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