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"SARS-CoV-2-naïve vaccinees had a 13.06-fold (95% CI, 8.08 to 21.11) increased risk for breakthrough infection with the Delta variant compared to those previously infected, when the first event (infection or vaccination) occurred during January and February of 2021"
https://www.medrxiv.org/content/10.1101/2021.08.24.21262415v1
A video explaining why a natural infection will intrinsically provide a more protective immune response Antibody Synthesis
