Single Shot Of Pfizer-BioNTech Covid-19 Vaccine Is 85% Effective, Study Finds<br/><a href="https://www.forbes.com/sites/roberthart/2021/02/19/single-shot-of-pfizer-biontech-covid-19-vaccine-is-85-effective-study-finds/" rel="noreferrer noopener" target="_blank">forbes.com</a>