definition of chickenpox
Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).The disease results in a characteristic skin rash that forms small, itchy blisters, which eventually scab over.hickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).