Background: Varicella zoster virus (VZV) is a widespread herpes virus that causes chickenpox after primary infection. Later the virus remains persistent in the sensory nerve ganglia. and it can be reactivated with the manifestation of herpes zoster most often. But reactivation of VZV can manifest as infection of the CNS (central nervous system) even in an immunocompetent host. https://www.roneverhart.com/