It could be thought of as a normal departure from the normal physiological parameters of an organism. In terms of virus infection pathogenesis results either directly from virus infection or from the response of the host to the virus Inflammation, headaches, fever and sometimes skin rash are the effect of the host response to virus invasion in the production of interferon and other cytokines. The vast majorities of virus infections are non-pathogenic and do not result in the disease state. E.g. rabies in foxes or other wild animal. Man is accidental host.
Viral pathogenesis is an abnormal state of no value to the virus.
The vast majority of viral infections are non-pathogenic. The infectious process in the animal kingdom. Mechanism of Entry. First question to ask, how do viruses get into the individual. Viruses generally can not pass through the skin, the surface of which is covered with hair, feathers or in the case of man with a thick impermeable layer of dead keratinized cells unless deliberately bypass the skin by injection.