Some differentially expressed genera in COVID-19 patients correlated with inflammatory IL-6 concentrations, including Gemella (r = 0.58; p = 0.025), Lactonifactor (r = −0.58; p = 0.025), and Anaerobutyricum (r = −0.52; p = 0.042) (Figure 6F). The gene discussed is IL6; the disease is COVID-19.