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. Main focus of this field is to study about molecular and biological basis of induced virus diseases of the nervous system. It also studies the uses of these viruses as tracers of neuroanatomical pathway and as vector for gene therapy.