Figure 1.

Receptor binding domain antibodies against SARS-CoV-2 variants following infection, vaccination, or vaccination after infection. The samples with a valid absorbance (OD) value for groups of participants who had SARS-CoV-2 infection, vaccination, or vaccination following infection are shown; 428 samples from 384 individuals collected >14 days and ≤90 days after the diagnosis or the final dose of the vaccine were included. The box plots with median, upper, and lower quartiles and minimum and maximum values for postinfection samples with an OD value from individuals who were infected, postvaccination samples from individuals who were only vaccinated, and postvaccination samples from individuals vaccinated after infection are shown in blue, red, and green, respectively. Abbreviations: OD, optical density; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.