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What are signs of severe allergic reaction to influenza vaccine?

ANSWER

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

SOURCES:

CDC web site: "Possible Side Effects of Vaccines;" "Seasonal Influenza (Flu): Key Facts about Seasonal Influenza (Flu);" "Live Intransal Influenza Vaccine;" and "Seasonal Influenza: Q&A Nasal Spray Vaccine."

Flu.gov web site. "Vaccination."

National Institute of Allergy and Infectious Diseases: "Types of Vaccines."

GlaxoSmithKline.

News release, American College of Allergy, Asthma and Immunology.

Reviewed by Jennifer Robinson on August 8, 2018

SOURCES:

CDC web site: "Possible Side Effects of Vaccines;" "Seasonal Influenza (Flu): Key Facts about Seasonal Influenza (Flu);" "Live Intransal Influenza Vaccine;" and "Seasonal Influenza: Q&A Nasal Spray Vaccine."

Flu.gov web site. "Vaccination."

National Institute of Allergy and Infectious Diseases: "Types of Vaccines."

GlaxoSmithKline.

News release, American College of Allergy, Asthma and Immunology.

Reviewed by Jennifer Robinson on August 8, 2018

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THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

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