Abstract
Viral multiplication is strictly intracellular, hence we have to consider as its essential process the production of viral materials within virus infected or virus carrying cells.
The process of viral infection and multiplication was described. These events will be considered in termes of the following steps: absorption, penetration, change to non-infective form, replication of virus subunits, assembly of subunits or maturation, extrusion and cell lysis.
The activity of neutralizing antibody and interferon on viral immunity was discussed. Furthermore, the problems of humoral and cellular immunity on viral infection were presented.
Finally, it was emphasized that relationships between virus and carcinogenesis will suggest a important problems in analysis of the mechanisms of carcinogenesis.
