Key Messages on Vaccine Safety in Canada
(source: Public Health Agency of Canada)
- The vaccines used in Canada are highly effective and extremely safe.
- Serious adverse reactions are rare. The dangers of vaccine-preventable diseases are many times greater than the risks of a serious adverse reaction to the vaccine.
- Health authorities worldwide take vaccine safety very seriously. Expert committees in Canada investigate reports of serious adverse events.
- Common mild reactions to vaccine(s) may include redness, itching and/or rash at the injection site and less commonly, headache, dizziness and nausea may occur. Severe allergic reactions are very rare. Seek medical attention immediately if you develop any of the following symptoms within 3 days of getting the needle: hives, swelling of the mouth and throat, trouble breathing, hoarseness or wheezing, high fever (over 40⁰C/104⁰F), convulsions or seizures, or any other serious reaction to the vaccine.
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