More than 100 COVID-19 vaccine recipients were hospitalized with myocarditis or pericarditis complications in Canada’s most populous province.

Public Health Ontario (PHO) quietly released an August report on heart inflammation data among those who took messenger ribonucleic acid (mRNA) vaccines between Dec. 13, 2020 and Aug. 7, 2021 in the Heartland Province.

It showed PHO initially received 314 reports of myocarditis or pericarditis reactions. However, the number was revised down to just over 200 after additional inquiries.

A total of 106 cases of myocarditis/pericarditis affected patients aged under 25 as of Aug. 7. This accounts for more than half of all such events.

Ontario administered 20,917,550 doses, with 83.5% of the population fully vaccinated as of Sept. 4. Pfizer is the only vaccine administered in the province for patients aged between 12 and 17. Thirty one adverse reactions were also reported for the same group, representing 15.2%.

There were 75 cases (36.8%) in the 18 to 24-year-old age group. Most adverse reactions were reported among males between 18 and 24 years-old who received their second mRNA jab.

Excluding age and based on the gender alone, males accounted for the vast majority of the side-effects at 80%.

Myocarditis/pericarditis reports following COVID-19 mRNA vaccination in Ontario, Canada, between Dec. 13, 2020 and Aug. 7, 2021 (Screenshot via TheBL/Public Health Ontario website)

The U.S. Centers for Disease Control and Prevention (CDC) describes myocarditis as a kind of heart muscle inflammation, and pericarditis as inflammation of the heart’s outer lining.

Such reactions rarely occur when the body’s immune system responds to an infection or another trigger. However, CDC found these reactions were more common after the second vaccine dose, especially when administering the Moderna jab.

The reported rate of Pfizer side-effects was 6.4 per million doses for the first dose and 8.7 per million doses for the following shot. Moderna’s rates were 6.6 per million doses and 28.2 per million doses respectively.

There were a total of 202 emergency room visits for similar concerns, following vaccination across all age categories. A total of 146 were hospitalized according to PHO. Three cases resulted in admission to the intensive care unit. No fatalities appeared in the report.

Myocarditis/pericarditis reports following COVID-19 mRNA vaccination in Ontario, Canada between Dec. 13, 2020 and Aug. 7, 2021. (Screenshot via TheBL/Public Health Ontario)

PHO stressed heart inflammation is an acute effect of mRNA vaccination, and reporting rates remain low.

“COVID-19 vaccines continue to be recommended and are highly effective at preventing symptomatic infection and severe outcomes from COVID-19 disease, which is also associated with a risk of myocarditis,” the report said.

At the beginning of September Ontario announced plans to impose vaccine passports and mandates for nearly all indoor settings. This includes bars, restaurants, gyms, and even music festivals.

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