(CNN) Pfizer-BioNTech's Covid-19 vaccine appears to reduce symptomatic coronavirus infections by more than 90% in the real world, Israeli researchers said Sunday. The findings, while preliminary, suggest that the vaccine remains remarkably effective in a mass vaccination campaign -- outside the carefully controlled conditions of a clinical trial. The Clalit Research Institute, part of a large Israeli health system, analyzed data on 1.2 million people, about half of whom had received the Pfizer-BioNTech vaccine. Researchers compared patients who received the vaccine with similar individuals who hadn't. Still, the findings are consistent with data from Pfizer's own vaccine trial , which found that the vaccine conferred 95% protection against symptomatic Covid-19.

Source: CNN February 15, 2021 09:33 UTC