EGFR and COVID-19: The mechanism of Lianhua Qingwen in the treatment of COVID-19 may be to improve human immunity by participating in T-cell and B-cell receptor signal transduction and natural killer cell-mediated cytotoxicity, as well as to exert anti-inflammatory effects through Fc epsilon RI, ErbB, ErbB, MAPK and other signal pathways (Ye et al., 2020).