Pfizer Applies for Emergency F.D.A. Approval for Covid-19 Vaccine. Coronavirus (2019-nCoV), Vaccination and Immunization, Pfizer Inc, Food and Drug Administration, Clinical Trials, Factories and Manufacturing, Drugs (Pharmaceuticals), Nursing Homes, Regulation and Deregulation of Industry, Moderna Inc, United States, your-feed-science, your-feed-healthcare