TLR9 and COVID-19: There was positive significant correlation between ESR and mRNA expression of TLR3 (rho = 0.71, P = 0.005), TLR7 (rho = 0.62, P = 0.011), TLR8 (rho = 0.65, P = 0.029), and TLR9 (rho = 0.40, P = 0.044) in all COVID-19 cases (Table 4).