The field of neurovirology was formed in the past 30 years. It was found to the discovery of the large number of virus and which are capable for invading establishment of large number of virus and also invading for establishing a latent infection in nervous tissue. The main focus of this field to study about molecular and biological basis of induced virus diseases of the nervous system It also studies  the uses of this viruses as tracers of neuroanatomical pathway and as vector for gene therapy.