What is clear, however, is young people with antibodies (either through vaccination or prior infection) don't need to live in fear.
"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. The increased risk was significant (P<0.001) for symptomatic disease as well."
https://www.medrxiv.org/content/10.1101/2021.08.24.21262415v...