Aiming at finding discriminant oral cytokines for COVID-19 status, we employed volcano plot (Figure 2C) and VIP plot (Figure 2D), finding out seven COVID-19-related discriminant cytokines (IL-6, IL-5, GCSF, IL-2, TNF-α, GMCSF, and INF-γ), while only one (IL-12p70) for controls. Here, IL2 is linked to COVID-19.