FFAR2 and COVID-19: The nasopharyngeal swabs of critical (hospitalized in intensive care unit (ICU)) qPCR positive COVID-19 patients (n = 31) and qPCR negative controls (n = 11) were subjected to RNA isolation and qPCR analysis for FCGR3B and FFAR2. Among patients with severe COVID-19, 50% had greater than 1.5-fold change of FCGR3B compared with 28.1% in controls (Figure 4B).