|Chickenpox is a highly contagious, yet common disease caused by the varicella-zoster virus. It develops into an itchy rash with an outbreak of blisters that occurs on the scalp, face and torso. It is usually a mild illness which occurs in children but can also cause serious complications in teenagers, adults, pregnant women, newborns and people with weak immune systems.
Symptoms may appear between 10 and 21 days of the time of exposure to the virus. Chickenpox affects approximately 4 million people per year, predominantly children.