As shown in Figure 1, 14 fucosylated glycans (GP4, GP6, GP8, GP9, GP10, GP14, GP16, GP18, GP19, Fn total, FG2n total/G2n, Fn, FG1n/G1n, and FG2n/G2n) were significantly lower in the COVID-19 group when compared to the controls. Here, GP9 is linked to COVID-19.