Updated US Infection- and Vaccine-Induced SARS-CoV-2 Seroprevalence Estimates Based on Blood Donations, July 2020-December 2021

Abstract

1.21-2.18), and 0.37 vs 0.16 for diagnoses on hospital day 15 or later (RR, 2.31; 95% CI, 1.53-3.49). The increase in hospital-onset infections during the Omicron wave vs the prior winter wave mirrored similar increases in community and health care worker case numbers during these same periods (Figure).