Lost in the Pfizer press release that vaccine is 90% effective: ‘Percentage may vary’

Article Link: https://www.recorder.ca/health/pfizer-vaccine-is-90-per-cent-effective/wcm/dc5b9da0-6cf7-46f0-84ce-db142fb555d4?video_autoplay=true

Some 420 words into Pfizer Inc.’s press release announcing that a first peek at early data suggests its COVID-19 vaccine is more than 90 per cent effective, signalling a “great day for science and humanity,” came this cautionary note: “As the study continues, the final vaccine efficacy percentage may vary.” The press statement, which sent hopes and global stock markets surging, was based on 94 confirmed cases of COVID-19 in a trial that has enrolled nearly 44,000 people, nearly 39,000 of whom have received both doses of the experimental vaccine known as BNT162b2.