Matefo L, Cloete VV, Armand BP, Dominique G, Samantha P, John F, et al. Validation of laboratory developed serology assays for detection of IgG antibody to severe acute respiratory syndrome coronavirus 2 in the South African population. J Virol Methods. 2022;307:114571. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9212509/