K03861, an inhibitor of CDK2, modestly but significantly decreased the infection rate of M1 virus in a concentration‐dependent manner in HCT‐15 and MIA PaCa‐2 cell lines (Fig. 5A,B), and titer of M1 virus was subsequently significantly inhibited by K03861 in these cell lines (Fig. 5C,D), phase‐contrast and fluorescence imaging also showed the inhibition of M1 viral infection by K03861 (Fig. 5E). The gene discussed is CDK2; the disease is viral infectious disease.