"There is laboratory evidence that persons previously infected with the original lineage of SARS-CoV-2 have reduced neutralizing antibody titers against certain

"There is laboratory evidence that persons previously infected with the original lineage of SARS-CoV-2 have reduced neutralizing antibody titers against certain variants (i.e., Beta, Gamma, and Delta variants)" https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/vaccine-induced-immunity.html#anchor_1635546906501 https://www.cdc.gov/coronavirus/2019-ncov/science/science-br...