VACCINE RESOURCE COMMITTEE

of the Edmonton Zone Medical Staff Association

View Full List of Vaccine Questions Here

General Vaccine Question #13:

Are there true allergic reactions to vaccines?

Anaphylaxis is very rare and occurs at a rate of approximately one case per million doses for many vaccines. For that reason, EpiPens and other equipment are carried by vaccine administrators.

Symptoms of anaphylaxis may include: 

  • Hives

  • Trouble breathing

  • Swelling of the throat, tongue, or lips

  • Vomiting

  • Hypotension

  • Potential death

Anaphylaxis usually occurs within minutes of receiving a vaccine, which is why it is important for patients to stay at the clinic for 15 minutes after getting vaccinated. If a patient experiences an adverse event following immunization, a care provider should complete the appropriate Adverse Events following Immunization (AEFI) Form and send it to the appropriate provincial or territorial authority. Reporting adverse events is a key part of Canada’s vaccine safety monitoring program. For more information on reporting adverse events and vaccine safety, please visit the vaccine development, approval, & safety monitoring page.

Even if it is not clear whether the vaccine caused the issue, reporting it is important. This helps ensure that potential safety concerns can be investigated, and action can be taken if needed.

Immunization aftercare sheets are available here to provide information on what to expect after vaccination, including potential side effects and information for patients to care for themselves and children. Most people who experience an adverse event after vaccination can safely receive vaccines again.

Sources

Government of Canada: Reporting Adverse Events Following Immunization (AEFI) in Canada
Immunize BC: Safety: Side Effects