In a different way, whereas IFN-α showed a positive correlation with IL-6 in the control group without SIgA, the IFN-α showed a positive correlation with IL-10 in the control group with SIgA, with IFN-γ in the COVID-19 group with SIgA, and with IL-13 in both COVID-19 groups. Here, IL6 is linked to COVID-19.