Posted in Search Pfizer Covid-19 vaccine works well in big ‘real world’ test February 25, 2021 A pharmacist prepares a syringe with the Pfizer-BioNTech COVID-19 vaccine at a COVID-19 vaccination site at NYC Health + Hospitals Metropolitan, in New York, on Feb. 18, 2021. https://www.nbcnews.com/health/health-news/pfizer-covid-19-vaccine-works-well-big-real-world-test-n1258790