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Vaccines Health Center

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Chickenpox (Varicella) - Topic Overview

Chickenpox (varicella) is a contagious illness that causes an itchy rash and red spots or blisters (pox) all over the body. Chickenpox can cause problems for pregnant women, newborns, teens and adults, and people who have immune system problems that make it hard for the body to fight infection.

Chickenpox usually isn't a serious health problem in healthy children. But a child with chickenpox needs to stay home from school. And you may need to miss work in order to care for your child.

After you have had chickenpox, you aren't likely to get it again. But the virus stays in your body long after you get over the illness. If the virus becomes active again, it can cause a painful viral infection called shingles.

Chickenpox is caused by the varicella-zoster virus. It can spread easily. You can get it from an infected person who sneezes, coughs, or shares food or drinks. You can also get it if you touch the fluid from a chickenpox blister.

A person who has chickenpox can spread the virus even before he or she has any symptoms. Chickenpox is most easily spread from 2 to 3 days before the rash appears until all the blisters have crusted over.

You are at risk for chickenpox if you have never had the illness and haven't had the chickenpox vaccine. If someone you live with gets chickenpox, your risk is even higher because of the close contact.

The first symptoms of chickenpox usually develop about 14 to 16 days after contact with a person infected with the virus. Most people feel sick and have a fever, a decreased appetite, a headache, a cough, and a sore throat. The itchy chickenpox rash camera.gif usually appears about 1 or 2 days after the first symptoms start.

After a chickenpox red spot appears, it usually takes about 1 or 2 days for the spot to go through all its stages. This includes blistering, bursting, drying, and crusting over. New red spots will appear every day for up to 5 to 7 days.

It usually takes about 10 days after the first symptoms before all blisters have crusted over. This is when the person with chickenpox can return to day care, school, or work.

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