Chickenpox used to be very common in the United States. But the good news is that the vaccine has greatly reduced the number of people who get it. Chickenpox is very contagious — it spreads easily from person to person. Certain people — like infants, people with weakened immune systems, and pregnant women — are at increased risk for complications. The chickenpox virus can also cause shingles later in life. Shingles is a disease that causes a painful skin rash and can affect the nervous system.
Why Vaccinate Adults Against Chickenpox? – National Foundation for Infectious Diseases
Adults are 25 times more likely to die from chickenpox than children. Chickenpox may cause complications such as pneumonia or, rarely, an inflammation of the brain encephalitis , both of which can be serious. Chickenpox and shingles are caused by the same virus. Years or even decades later, the virus can reactivate and cause shingles.
Varicella (Chickenpox) Vaccine - What You Need to Know
How to Pronounce Varicella media icon [MP3]. Chickenpox is a highly contagious disease caused by the varicella-zoster virus VZV. It causes an itchy, blister-like rash.