Canadian researchers recommend delaying the second dose of Pfizer vaccine, say the first dose is “highly effective”

By BBN Staff: Two Canadian researchers are saying that the Pfizer COVID-19 vaccine is so effective, that those who have received the first dose can wait a little longer for the second so that more priority groups can benefit from getting their first dose, Reuters reports.

In a letter published in the New England Journal of Medicine, researchers Danuta Skowronski and Gaston De Serres said that the Pfizer vaccine has an efficacy of 92.6% based on an analysis of the documents that the company submitted to the U.S. Food and Drug Administration (FDA). The findings paint a slightly more favorable picture than the 92.1 percent efficacy observed from the Moderna COVID-19 vaccine.

The second dose of the Pfizer vaccine is authorized to be taken 21 days after the first. Health authorities in the United States and Europe have, thus far, adhered to that schedule.

Pfizer responded to the researchers’ recommendation, with a statement noting that alternative dosing regimens of the vaccine had not been evaluated yet and that the decision resided with the health authorities.

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