Serum S100A12 levels of controls were the lowest with 0.39 (0.06–1.51) μg/mL, were higher in moderate COVID-19 with 0.56 (0.02–6.81) μg/mL and with 0.83 (0.21–4.13) μg/mL were highest in severe COVID-19 patients (Figure 1a). Here, S100A12 is linked to COVID-19.