Single dose of Pfizer, Moderna COVID vaccine nearly as effective as two: study

Single doses of the Pfizer and Moderna vaccines are more than 92 percent effective in preventing COVID-19 illness after two weeks, Canadian researchers are now saying. The FDA’s own data show that a single shot of the BioNTech-Pfizer vaccine is 92.6 percent effective after two weeks, and a single Moderna jab is 92.1 percent effective,…