Your questions about covid, answered: Is there reliable data about Russian vaccines?

A turning point came in February, when the results of a large clinical trial were published in the Lancet, a well-respected medical journal. The study, which involved nearly 20,000 participants, showed that Sputnik V was about 91.6 percent effective at preventing symptomatic illness. That appeared to put in on par with the Pfizer-BioNTech and Moderna vaccines.