The Lancet Infectious Diseases Volume 21, Issue 6, June 2021, Page 769 Correspondence What does 95% COVID-19 vaccine efficacy really mean? Author links open overlay panelPiero Olliaro a Show more Share Cite https://doi.org/10.1016/S1473-3099(21)00075-X Get rights and content Previous article in issue Next article in issue Recommended articles Cited by (0) View Abstract © 2021 Elsevier Ltd. All rights reserved.