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. 2021 May 12;16:32. doi: 10.1186/s13027-021-00375-2

Fig. 1.

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