Chickenpox, also known as varicella, is a highly contagious disease caused by the varicella-zoster virus (VZV). It is a self-limiting disease that presents during childhood, but can cause severe illness and complications in adolescents and adults. When an individual is infected by the varicella-zoster virus, blister-like rashes can easily develop on the face and stomach, and then spread throughout the entire body. The virus remains dormant in the nerve cells, and may reactivate in later adult ye...