What are the side effects of the measles vaccine?
Apr 25, 2022
Source: Cainiu Health
Dr. Gan Liqiang
Introduction
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.
Routine vaccination helps prevent disease; specifically, the measles vaccine prevents measles infection. What are the side effects of the measles vaccine?
What Are the Side Effects of the Measles Vaccine?
Fever is a common side effect of the measles vaccine: The measles vaccine contains a live, attenuated virus. Once introduced into the body, this virus may trigger transient immune activation and mild systemic reactions—including fever—as the immune system responds. This fever reflects the body’s natural immune response to the vaccine and typically resolves on its own as the body adapts. Mild fever following vaccination is normal and generally requires no intervention.
Fatigue is another possible side effect: Following vaccination, some individuals may experience temporary fatigue or reduced energy levels. This occurs because the immune system temporarily redirects resources toward mounting a response to the vaccine—a normal physiological reaction. After vaccination, adequate rest is recommended. Bathing should be avoided for at least 24 hours, and the injection site should remain dry to minimize the risk of local irritation or infection. Fatigue during this period is expected and not a cause for concern.
Diarrhea may also occur: Some individuals develop mild, transient diarrhea after receiving the measles vaccine. This is a recognized, self-limiting side effect and typically resolves within a few days without specific treatment. It results from temporary immune modulation and does not indicate serious illness. We hope this information is helpful!
