SH2D3A and viral infectious disease: These intensive studies reveal many attractive targets for anti-SARS-CoV-2 drug discovery and repurposing, including the viral non-structural proteins (nsp1–16), viral structural proteins (e.g., S and nucleoprotein), and host receptors and enzymes related to virus infection or reproduction in host cells, such as ACE2, TMPRSS2, DHODH, and PAR-1 [11,12].