They have NOT completed the phase 3 trials. At this point they are rushing the 3rd phase. Also, children, elderly, and those with pre existing conditions were not part of the clinical trials. Those are now guinea pigs.
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Phase 3 of the Pfizer trials was completed in January 2021. Approximately 40% of the trial participants were age 56 or over.
https://www.pfizer.com/science/coronavirus/vaccine/about-our-landmark-trial