Symptoms of Severe Reactions to Vaccinations
Although severe reactions are extremely rare, parents should know how to respond.
Call the doctor immediately if a child has any of the following symptoms.
- Extremely High Fever. A rectal temperature of 105 F or higher. (Temperatures taken under the arm or by mouth often register lower than actual temperatures.)
- Inconsolable Crying. The child has been crying for over 3 hours without stopping or has a cry that isn't normal, such as a high-pitched sound.