CD8A and viral infectious disease: In the viral infection module, the following equations show how SARS-CoV-2 virus infects lung epithelial cells:d[nCoV]dt=N1dIf[If]−dv[nCoV]Km+[nCoV]−{fAntVAPCk1clear[APCl]+fAntVAPCk2clear[APCu]+k3clear[Neut]+k4clearA[Ab]}[nCoV](1)d[If]dt=kinfect[nCoV][H]−dIf[If]−{fAntVAPCk1kill[APCl]+fAntVAPCk2kill[APCu]+feffNKk3kill[NK]+k4kill[CTL]+k5kill[CD8+TM]}[If](2)d[H]dt=rH−kinfect[nCoV][H]−dH[H](3)