https://techcrunch.com/2020/11/09/pfizers-covid-19-vaccine-proves-90-effective-in-first-results-from-phase-3-clinical-trial/

The COVID-19 vaccine being developed by Pfizer and its partner BioNTech has shown to be effective blocking vaccine in 90 percent of participants in its Phase 3 clinical trial, the companies announced on Monday. That’s based on data analyzed by an external, independent committee assigned to check the results of the trial, and reflects only early results from the trial, and not the final verified result, but it’s still extremely promising news for progress towards a viable and more broadly available vaccine.

Pfizer and BioNTech’s vaccine candidate is an mRNA-based vaccine, which is a newer technology that many companies pursued for COVID-19 in part because it offers some advantages in pace of development and potential efficacy. These results from the test were based on an equable case total of 94 confirmed COVID-19 cases among study participants – passing the minimum threshold agreed to by the companies and the FDA of 62 confirmed cases for a proper, scientifically rigorous assessment.