Pharma giant Pfizer claims that their COVID-19 vaccine is more than 90% effective
The vaccine candidate, BNT162b2, has prevented more than 90% of infections during Phase 3 trials
The vaccine candidate is jointly developed by Pfizer and BioNTech
Tens of thousands of volunteers received two doses of the vaccine each during the trials
If approved, the drugmakers estimate they can roll out up to 50 million doses this year
