After adjusting for age, sex, booster type, and COVID‐19 incidence, HRs for booster response binding antibody levels were 0.89 (95% CI [0.84, 0.95]) for WT IgG and 0.95 (95% CI [0.92, 0.98]) for BA.1 IgA for each percent increase in binding antibodies, respectively (Figure 5A). This evidence concerns the gene CD79A and COVID-19.