An error appeared in the corrected proof publication of this article (Sharma et al. “Effectiveness of Messenger RNA–based Vaccines During the Emergence of the Severe Acute Respiratory Syndrome Coronavirus 2 Omicron Variant.” Clin Infect Dis; https://doi.org/10.1093/cid/ciac325). In the “Methods” section of the paper, the sentence “Vaccine effectiveness (1 – risk ratio) was calculated for 3 measures: primary-series compared with unvaccinated, third-dose compared with unvaccinated, and primary-series compared with third-dose” should read “Vaccine effectiveness (1 – risk ratio) was calculated for 3 measures: primary-series compared with unvaccinated, third-dose compared with unvaccinated, and third-dose compared with primary-series” to better align with the presentation of the results.
The authors regret the error.