I'm really sorry, I linked the wrong article. The quote in my comment is from the abstract of this [1] study. It's a meta-analysis by a professor of epidemiology at Yale. He also wrote an op-ed that ran in Newsweek. [2]

[1] https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa093...

[2] https://www.newsweek.com/key-defeating-covid-19-already-exis...