Although it’s rare, someone may have a severe allergic reaction to an ingredient in the vaccine. Most of the time, such reactions occur within a few minutes to a few hours of receiving the vaccine. The following can be signs of a severe allergic reaction:
Seek immediate medical care if you notice any of these signs after receiving the influenza vaccine.
- Behavior changes
- Breathing difficulty, including wheezing
- Dizziness
- Hoarse voice
- High fever
- Hives
- Pale skin
- Rapid heart beat
- Weakness