CCL17 and COVID-19: We observed lower TARC/CCL17 concentrations in COVID-19 positive patients (median serum levels are 124.4 pg/mL in the non ICU admitted patient group, and 131.7 pg/mL in the ICU admitted patient group) compared to COVID-19 negative patients (median 301.3 pg/mL) (Figure 1A, p = 0.002).