Is the chance of fever after the Japanese encephalitis vaccine high?
Dec 29, 2022
Source: Cainiu Health
Dr. Guo Xiheng
Introduction
The likelihood of developing fever after receiving the Japanese encephalitis vaccine is not particularly high; only a small number of children may experience fever, with body temperature usually around 38°C. Generally, this type of fever does not require special treatment and will resolve on its own within 24 hours. It can also be managed with antipyretic medications or physical cooling methods to improve body temperature. Such fever does not need specific treatment.
In daily life, many babies may develop a fever after vaccination, which often causes concern and anxiety among caregivers. Is the likelihood of fever high with the Japanese encephalitis (JE) vaccine?
How likely is fever after the JE vaccine?
The chance of developing a fever after receiving the JE vaccine is not particularly high. Only a small number of children may experience mild fever, typically around 38°C. This type of fever usually does not require special treatment and will resolve on its own within 24 hours. It can also be managed with fever-reducing medications or physical cooling methods. In most cases, no specific treatment is needed.
It is relatively common for children to develop a mild fever after receiving the JE vaccine. However, the fever is generally low-grade and short-lived. Aside from the fever, most babies do not show other significant abnormalities. In some individual cases, body temperature may temporarily rise significantly—above 38°C—accompanied by lethargy or cold extremities. In such situations, temporary use of antipyretics may be considered, with acetaminophen (paracetamol) being the preferred choice.
Additionally, ensure your child drinks plenty of fluids frequently. If the fever is not high, increasing fluid intake is usually sufficient, as the body can naturally regulate and return the temperature to normal. If the fever lasts more than three days, or if the child develops other noticeable symptoms beyond fever, it is important to consult a pediatrician promptly to rule out other underlying conditions. If another illness is identified, appropriate treatment should be initiated without delay. We hope this information is helpful. Wishing you good health and happiness.
