Pfizer is in phase 3 and that's where they test tons of people.
Pfizer is more certain in efficacy.
1. Phase I: https://clinicaltrials.gov/ct2/show/NCT04283461
2. Phase III: https://clinicaltrials.gov/ct2/show/NCT04470427
Pfizer is in phase 3 and that's where they test tons of people.
Pfizer is more certain in efficacy.