As of Aug. 7, there were 106 incidents of myocarditis/pericarditis in Ontarians under the age of 25. That’s slightly more than half of the total of all such incidents.
Broken down further, 31 of these cases were in 12- to 17-year-olds and 75 were in 18- to 24-year-olds. The vast majority — 80% — were in males.
The report explains that PHO issued a directive in June for public health units to increase their surveillance of this side effect following reports from the United States and Israel of similar concerns unfolding in those countries.
“The reporting rate of myocarditis/pericarditis was higher following the second dose of mRNA vaccine than after the first, particularly for those receiving the Moderna vaccine as the second dose of the series (regardless of the product for the first dose),” the report explains.
PHO adds that the reporting rate for heart inflammation in those 18-24 was seven times higher with Moderna than with Pfizer. (The only vaccine currently used for 12- to 17-year-olds in Ontario is Pfizer.)
While PHO initially worked with reports of 314 such incidents, upon further investigation they narrowed that number down to just over 200.