Fig. 1

Vaccine immune response monitoring in previously infected and not previously infected cohorts of healthcare providers. Previously infected subjects = subjects previously infected to SARS-CoV-2. Not previously infected subjects = subjects not previously infected to SARS-CoV-2. Pre = anti - SARS-CoV-2 S titers (expressed in BAU/mL) before the first dose. Post I = anti - SARS-CoV-2 S titers (expressed in BAU/mL) 20 days after the first dose. Post II = anti - SARS-CoV-2 S titers (expressed in BAU/mL) 8 days after the second dose