There's a recent (January 19, 2022) CDC publications with numbers on exactly that. Forbes provides a brief overview: "CDC: Prior Covid Infection Offered More Pr

There's a recent (January 19, 2022) CDC publications with numbers on exactly that. Forbes provides a brief overview: "CDC: Prior Covid Infection Offered More Protection Against Delta Than Vaccines — But Both Together Did Best" https://www.forbes.com/sites/joewalsh/2022/01/19/cdc-prior-covid-infection-offered-more-protection-against-delta-than-vaccines---but-both-together-did-best/?sh=500d15ba3d04 https://www.forbes.com/sites/joewalsh/2022/01/19/cdc-prior-c...