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Acknowledgments
Feikin DR, Higdon MM, Abu-Raddad LJ, et al. Duration of effectiveness of vaccines against SARS-CoV-2 infection and COVID-19 disease: results of a systematic review and meta-regression. Lancet 2022; 399: 924–44—In this Article, in table 4, in the first column, the fifth row should read “Infection-derived, immunity increases among people who are unvaccinated”. The appendix has also been corrected. These corrections have been made to the online version as of April 4, 2022.