The viral proteins play various roles during viral infection including virus replication (7 K, CI, 14 K, VPg, CP, NIb, and P2), intercellular movement (P3, CI, 14 K, and PIPO), polyprotein translation, cleaving and processing (CP, NIa-Pro and VPg), endoplasmic reticulum export (14 K), viral particle assembly (CP) and RNA-silencing suppression (P1)31. This evidence concerns the gene CP and viral infectious disease.