Methods| The Oregon Health & Science University conducted large-scale vaccination of all
workforce members in accordance with Oregon vaccination guidelines between December
2020 and February 2021. Individuals were enrolled in this study during their first vaccination
visit and serum samples were collected prior to receipt of the first dose and 14 days after
receipt of the second dose of the BNT162b2 vaccine. Study participants were selected
randomly from a larger vaccine study cohort to maintain equal sex and age distribution …