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. 2022 May 19;9:820544. doi: 10.3389/fmed.2022.820544

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Copyright © 2022 Wang, Wang, Li, Xie, He, Wang, Zhang, Hou, Zhang and Jia.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Meta-analysis for the overall efficacy of vaccines against COVID-19 variants post first vaccine (A) and post second vaccine (B). * indicates the second arm in the study of Bernal et al. CI. confidence interval; OR, odds ratio.