CRP and COVID-19: The multivariate logistic regression analysis showed that age (OR = 1.026; 95% CI, 1.008–1.043; p = 0.004), WBC (OR = 1.087; 95% CI, 1.028–1.151; p = 0.004), and CRP (OR = 1.010; 95% CI, 1.004–1.017; p = 0.001) were independent risk factors for disease severity of COVID-19, while the ANA positivity (OR = 0.560; 95% CI, 0.348–0.902; p = 0.017) was an independent protective factor (Table 2).