neurotropic virus
英[ˌnjuərəuˈtrɔpik ˈvaiərəs]美[ˌnʊrəˈtrɑpɪk ˈvaɪrəs]
A neurotropic virus is a virus which is capable of infecting nerve cells,Word Reference: Neurotropic or which does so preferentially. Such viruses thereby able to largely evade the usual immune response as many elements of the immune response are prevented for reaching the site of infection by the blood brain barrier.