Figure 1. Study Design and Population.

Study design of the Sheba Medical Center health care workers (HCW) cohort following vaccination and infection with the Omicron variant. Ab indicates antibody.

^aPreviously uninfected HCW who received at least 3 doses of the BNT162b2 vaccine, performed at least 1 SARS-CoV-2 polymerase chain reaction (PCR) test at Sheba Medical Center and had undergone at least 1 serology test 3 to 30 days prior to PCR testing.