Has This Safety Monitoring Been Done? If So, What Were The Results?

FDA  | From Pfizer-BioNTech COVID-19 Vaccine Emergency Use Authorization Review Memorandum  - Page 44

5.2. Pharmacovigilance Activities
Pfizer submitted a Pharmacovigilance Plan (PVP) to monitor safety concerns that could be associated with Pfizer-BioNTech COVID-19 Vaccine. The Sponsor identified vaccine-associated enhanced disease including vaccine-associated enhanced respiratory disease as an important potential risk.