Pfizer Inc. and BioNTech SE announced that the U.S. government has purchased 50 million more doses of the companies’ COVID-19 vaccine. The U.S. will receive these additional doses to continue to support preparedness for pediatric vaccinations, including securing vaccines for children under 5 years of age, should they receive regulatory authorization. The companies expect to deliver all these doses by April 30, 2022.   With this order, the U.S. government has exercised its final purchase option...