Is Pfizer Recommending a Switch to a Single-Dose Policy?

In a letter to the New England Journal of Medicine on February 17, two Canadian researchers, Danuta Skowronski and Gaston De Serres, suggested “deferring second doses” of the COVID-19 vaccine “until all priority group members are offered at least one dose.” The suggestion is based on an analysis of documents from Pfizer that were submitted to the FDA, which found, among other things, that one single dose of the Pfizer vaccine is 92.6 percent effective against COVID-19.

Based on this research, a widely circulated tweet claims “Pfizer says new data...