COVID-19 / Flu
Coronavirus-19 and Influenza
The purpose of this study is to find out how often health problems occur after a COVID-19 and/or Influenza vaccine.
Location: British Columbia, Alberta, Ontario, Quebec, Nova Scotia, PEI, and Yukon Territory.
Study Summary
Study participants will receive an email 8 days and one month after they received their COVID-19 and/or Influenza vaccination inviting them to respond to a survey. Participants are asked questions regarding the occurrence of a list of signs and/or symptoms following immunization.
COVID-19 Vaccine Only
Both COVID-19 and Flu vaccines
Flu Vaccine Only
COVID-19 Vaccine Only
Total persons enrolled in study:
1217850
Surveys completed:
1st Survey
surveys completed
273178
2nd Survey
surveys completed
45280
People experiencing local reaction :
47.4%
Injection site
pain/swelling/redness
Most frequent other health events reported:
3.9%
Systemic symptoms
(fever, fatigue, muscle ache, feeling unwell)
2.5%
Headache or migraine
(fever, fatigue, muscle ache, feeling unwell)
1.3%
Nausea, vomiting, diarrhea
Rate of health events reported by unvaccinated vs vaccinated individuals
Vaccinated individuals reported health events at the same rate as unvaccinated individuals
Both COVID-19 and Flu vaccines
Total persons enrolled in study:
1217850
Surveys completed:
1st Survey
surveys completed
273178
2nd Survey
surveys completed
45280
People experiencing local reaction :
57.9%
Injection site
pain/swelling/redness
Most frequent other health events reported:
4.6%
Systemic symptoms
(fever, fatigue, muscle ache, feeling unwell)
3.1%
Headache or migraine
(fever, fatigue, muscle ache, feeling unwell)
1.5%
Nausea, vomiting, diarrhea
Rate of health events reported by unvaccinated vs vaccinated individuals
Vaccinated individuals reported health events at the same rate as unvaccinated individuals
Flu Vaccine Only
Total persons enrolled in study:
1217850
Surveys completed:
1st Survey Completed
273178
2nd Survey Completed
45280
People experiencing local reaction :
36.0%
Injection site
pain/swelling/redness
Most frequent other health events reported:
3.4%
Systemic symptoms
(fever, fatigue, muscle ache, feeling unwell)
2.3%
Headache or migraine
(fever, fatigue, muscle ache, feeling unwell)
1.2%
Nausea, vomiting, diarrhea
Rate of health events reported by unvaccinated vs vaccinated individuals
Vaccinated individuals reported health events at the same rate as unvaccinated individuals
As with any events reports, not all symptoms reported may be caused by the vaccine. They may be coincidental and/or due to other causes.