Yes, studying vaccine risks can lead to miscalculation


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What is real: There were 32 cases of myocarditis recorded in June and July among Canadians in the Ottawa area who had received the vaccine from Pfizer or Moderna.

This is an error: this number It represents not 1 in 1,000, as the authors first wrote, but 1 in 26,000. Researchers at the University of Ottawa made an error in listing the total number of doses given during the period covered: Instead of recording 850,000 doses, they Incorrectly Registered 32000.

Suddenly, 1 in 26,000 is closer to studies published in recent months on the risks of side effects associated with the Covid vaccine. For example, based on the first million people vaccinated in Israel, study Posted on September 16 in New England Journal of Medicine (NEJM), focusing only on the Pfizer vaccine, estimated the risk of developing myocarditis between 1 and 5 in 100,000. In Canada, the risk of the Pfizer vaccine is estimated at 1 in 100,000 and the Moderna vaccine is 2 in 100,000.

By comparison, the risk of developing myocarditis associated with the coronavirus is estimated to be 11 per 100,000, according to the study. NEJM.

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