PIP and COVID-19: In this study, 11 sialylated glycans (GP17, GP21, GP22, GP23, FGS/(FG+FGS), FGS/(F+FG+FGS), FG2S1/(FG2+FG2S1+FG2S2), FG2S2/(FG2+FG2S1+FG2S2), FBG2S1/(FBG2+FBG2S1+FBG2S2), FtotalS1/FtotalS2, and FBS1/FBS2) were higher in the COVID-19 patients (Figure 2).