Also in this group of proteins was cytidine deaminase, which causes G to A mutation in the complementary strand during DNA replication (genome replication) (28), and major capsid protein or mcp (genome assembly and release), which is usually expressed in the late stage of the viral infection, responsible for synthesizing virus capsid and participating in the assembly of new virions (29, 30). The gene discussed is CDA; the disease is viral infectious disease.