Similarly, Chen et al. studied a total of 29 COVID-19 patients, divided into three groups according to relevant diagnostic criteria, and found that IL-6 was higher in critical cases (n = 5 patients) than in severe cases (n = 9 patients) and that IL-6 was higher in severe cases than in mild cases (n = 15 cases) (23). The gene discussed is IL6; the disease is COVID-19.