In the combined mild and moderate/severe symptoms group of COVID-19 patients, levels of calprotectin correlated significantly with fMet levels (r = 0.60, p = 0.0007) (Figure 5a), an observation consistent with fMet/FPR1-mediated neutrophil activation from this subgroup of COVID-19 patients (Figure 4). Here, FPR1 is linked to COVID-19.