We identified a significant association between the increased value of ferritin (p < 0.0001, OR = 22.31) (Figure 3), fibrinogen (p = 0.009, OR = 13.41) (Figure 4), and C-reactive protein (p = 0.01, OR = 7.65) (Figure 5) and the level of severity of COVID-19. Here, CRP is linked to COVID-19.