Sessional Paper 8555-451-766 45th Parliament, 1st Session Tabled March 11, 2026 Q-766 — Ted Falk (Provencher)

Up to 20 Million Doses Were Administered After Health Canada Received a Myocarditis Warning, and Before the Public Was Told

31,659 adverse event reports of myocarditis and pericarditis following COVID-19 vaccination, disclosed through Written Question Q-766 in the House of Commons. Click each question to mark it on the timeline.

Context: COVID-19 vaccines are effective and have saved lives. This analysis examines one question: whether Canadians received timely information about a known cardiac risk — the standard applied to every other vaccine in Canada's history. All data is drawn directly from the Government of Canada's parliamentary response.
Total Reports Filed
31,659
Myocarditis & pericarditis following COVID-19 vaccination
Canadian (Domestic)
2,040
Canada Vigilance Program
International
29,619
Mandatory manufacturer submissions
Before First Public Warning
797
Reports in database before June 3, 2021
The Signal Timeline: Dec 2020 – Jul 2021
Combined monthly reports. Click each question to place it on the chart — the flag travels to your most recent selection.
Click to explore the timeline
Hover bars for monthly totals. Active poles show as solid; previous poles remain as faint markers.
February 27, 2021
"To date, no unexpected vaccine safety issues have been identified."
— Dr. Theresa Tam, Chief Public Health Officer of Canada · canada.ca
March 25, 2021
"We now have multiple safe and effective COVID-19 vaccines with unique advantages that are authorised for use in Canada."
— Dr. Theresa Tam, Chief Public Health Officer of Canada · canada.ca
May 4, 2021
"All vaccines approved for use in this country are safe and effective."
— Prime Minister Justin Trudeau & Dr. Theresa Tam, COVID-19 briefing · CBC News
May 22, 2021
"Multiple safe and effective COVID-19 vaccines, with unique advantages, are authorised for use in Canada."
— Dr. Theresa Tam, Chief Public Health Officer of Canada · PHAC Statement
Full Report Timeline: Dec 2020 – Jan 2026
Toggle each dataset to compare domestic and international reporting at scale.
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Download the raw data
Complete adverse event records as disclosed in Sessional Paper 8555-451-766. Each row is one report submitted to Health Canada's Canada Vigilance Program.
Canadian domestic reports 2,040 rows · CSV · 239 KB International reports 29,619 rows · CSV · 3.4 MB
Columns: Adverse Reaction Report Number · Reporter type · Form of notification · Recipient · Date received. Notifier names are protected under the Privacy Act. Data as of January 26, 2026.
Source: Sessional Paper 8555-451-766, tabled March 11, 2026. Written Question Q-766 (45th Parliament, 1st Session), asked by Ted Falk (Provencher), January 22, 2026. Reply by Minister of Health; signatory Maggie Chi. Data as of January 26, 2026.   ourcommons.ca/written-questions/45-1/q-766/13960253