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Fever After Vaccines? It's Normal, Experts Say
25 Apr
Summary
- Fever post-vaccination is a common immune response, not illness.
- Cytokines produced during immune response can temporarily raise body temperature.
- Age and prior exposure influence vaccine reaction severity and symptoms.
World Immunization Week, observed annually from April 24 to April 30, highlights the critical role of vaccines in global health. Vaccines, considered powerful public health tools, prevent diseases and have saved millions of lives. A fever after receiving a vaccine is a common and normal immune response.
This temporary increase in body temperature is caused by cytokines, which are produced as the immune system actively builds antibodies against introduced inactive germs. While not everyone experiences fever, its presence or absence does not determine a vaccine's effectiveness.
Individual immune responses can differ significantly due to factors such as age. Younger individuals often exhibit more robust reactions than older people. Prior exposure to a germ, either through infection or previous vaccination, can also lead to a smoother immune response, potentially reducing symptoms like fever.
