CD79A and infection: Longitudinal assessment of circulating IgA levels against SARS-CoV-2 Wuhan-Hu-1 (Figure 3b) and Omicron BA.1 FLS (Figure 3c) after two vaccines and a breakthrough infection and after three vaccines and an Omicron breakthrough infection (Figure 3d,e) showed that post-infection levels remained elevated over 150 days post infection.