IL6 and COVID-19: As illustrated in Table 5, IL-6, lymphocytes, and neutrophils were possible risk factors for COVID-19 infection, as well as IL-6 might represent the strongest factor associated with COVID-19 with a high odds ratio (OR: 24.138, 95% CI: 8.437–30.65, p < 0.01), more than the odds ratio of lymphocyte count (OR: 18.647, 95% CI: 1.542–22.719, p < 0.01) as seen in Table 5.