However, increased salivary levels of IL-12p70 (Figure 2C), IL-13 (Figure 2D), and IFN-α (Figure 2F), and no differences in IL-17 levels (Figure 2E) were also observed in the COVID-19 group with SIgA as compared to the results obtained in the COVID-19 group without SIgA. Here, IL13 is linked to COVID-19.