As with total IgA levels, the viral infection group exhibited higher blood sIgA levels (14–3428 ng/mL (median = 141 ng/mL)) than the bacterial infection group (3–1240 ng/mL (median = 78 ng/mL), p = 0.401) and non-infection group (26–1051 ng/mL (median = 62 ng/mL), p = 0.342); however, no statistically significant differences were noted (Figure 1b and Table 1). Here, CD79A is linked to bacterial infectious disease.