CD79A and infection: Pairwise contrast confirmed higher plasma IgA levels observed after vaccination (median: 6.47 OD index ratio; 95% highest posterior density (HPD) interval: 5.92–7.00), infection (median: 6.21 OD index ratio; 95% HPD: 5.94–6.45) or reinfection (median: 6.17 OD index ratio; 95% HPD: 5.96–6.38) compared with booster (median: 5.72 OD index ratio; 95% HPD: 5.35–6.12).