Indeed the final version has not been published yet, but there are no major reasons to doubt its validity. Here's an evaluation of the preprint from Johns Hopki

Indeed the final version has not been published yet, but there are no major reasons to doubt its validity. Here's an evaluation of the preprint from Johns Hopkins: https://ncrc.jhsph.edu/research/comparing-sars-cov-2-natural-immunity-to-vaccine-induced-immunity-reinfections-versus-breakthrough-infections/ https://ncrc.jhsph.edu/research/comparing-sars-cov-2-natural...