CHICAGO (WGN) Two Canadian researchers urge governments to delay second dose of Pfizer vaccine.
CTV News Reports Danuta Skowronski and Gaston De Serres said the data shows that one injection is over 92% effective, so a second dose does not add much benefit.
They reported their findings in a letter published in the New England Journal of Medicine Wednesday. Their findings are based on an analysis of documents that Pfizer submitted to the United States Food and Drug Administration.
The efficacy at the first dose of Moderna vaccine is similar, being 92.1%, according to the letter.
The researchers admit that there is uncertainty about the duration of immunity after a single dose, but they say giving a second injection a few weeks later doesn’t add much protection in the short term.
Pfizer responded by saying it had not evaluated other dosing regimens and would leave that decision to health officials, CTV News reported.
Using one dose per person would alleviate vaccine shortages. Health officials and healthcare providers say their biggest challenge is the limited supplies and the variability in doses distributed from week to week.
Even with the increased shipments recently announced by President Joe Bidens’ administration, local officials and suppliers say demand outweighs the number of doses available.
Even so, the United States immunizes an average of 1.7 million Americans per day, up from less than a million a month ago. And according to data from the Centers for Disease Control and Prevention, much of the increase is from people receiving their second dose.
The pace of first dose vaccinations has been largely stable over the past few weeks, hovering around an average of 900,000 injections per day.
The Associated Press contributed to this report.
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