To compare binding titers to SARS-CoV-2 S protein and RBD between sera from vaccinated macaques and those from convalescent humans from the COVID-19 Specific Antibodies (COSCA) cohort (sampled ∼4 weeks after the onset of symptoms) (Brouwer et al., 2020), a different ELISA protocol was used. This evidence concerns the gene PROS1 and COVID-19.