Varicella-zoster virus (VZV) is a human herpes virus which causes varicella (chicken pox) as a primary infection. and. following a variable period of latency in neurons in the peripheral ganglia. may reactivate to cause herpes zoster (shingles) as well as a variety of neurological syndromes. https://www.roneverhart.com/Doorking-1835-080-Telephone-Entry-System/