Chickenpox & Shingles
The chickenpox virus (varicella-zoster, VZV) may remain in a dormant state in the body after an individual has chickenpox, usually in the roots of nerves that control sensation. In about one out of five people previously infected with chickenpox, the virus "wakes up," or reactivates, often many years or decades after a childhood chickenpox infection. When the virus is reactivated and causes shingles, the resulting virus is usually referred to as herpes zoster virus. Researchers do not know what causes this reactivation. What is known is that after reactivation, the virus travels along a sensory nerve into the skin and causes shingles.