Chickenpox (Varicella) is is a very contagious disease caused by the varicella-zoster virus (VZV). It causes a rash illness with itching, tiredness, and fever. Chickenpox can be prevented by getting vaccinated.
Chickenpox is most common in young children and typically lasts for 5-7 days.
Some groups are at risk for complications:
Symptoms include an itchy skin rash with blister-like lesions, covering the body. The lesions will scab over in approximately 5 days. It may first appear on the face, chest, and back and then spread to other parts of the body. Most, but not all, infected individuals have fever, which develops 1-2 days before the rash appears. People may also experience tiredness, loss of appetite, and headache.
If exposed, some people who have been vaccinated against the disease may get a milder illness with a less severe rash (sometimes involving only a few red bumps that look similar to insect bites) and mild or no fever.
Chickenpox is very contagious and can be spread from one person to another through the air or through contact with chickenpox blisters. When someone with chickenpox coughs or sneezes, viral particles are released into the air. Someone who breathes in the viral particles is exposed, and may get infected. If they do get infected, they will start showing symptoms within 10 - 21 days after being exposed (typically 14-16 days after exposure).
A person with chickenpox can spread the disease from 1-2 days before they get the rash until all their chickenpox blisters have formed scabs.
Varicella vaccine can prevent chickenpox. Currently, two doses of vaccine are recommended for children, adolescents, and adults. The first dose should be given between 12-15 months of age and the second dose should be given between 4-6 years of age.
If you or your child has been exposed to a person with chickenpox and are not immune*, there are some measures you can take to prevent infection, such as vaccination. What treatment you can receive will depend on your health status and when you were exposed, so please contact your healthcare provider for more information.
*Evidence of immunity is defined as any of the following:
Laboratory testing for chickenpox is recommended. A diagnosis of chickenpox can also be made by observing the symptoms and the typical appearance of the rash.
People can do several things at home to help relieve chickenpox symptoms. Because scratching the blisters may cause them to become infected, keep your fingernails trimmed short. Calamine lotion and oatmeal baths may help relieve some of the itching. Use non-aspirin medications, such as acetaminophen, to relieve fever from chickenpox. The use of aspirin in children with chickenpox has been associated with Reye’s syndrome, a severe disease that affects the liver and brain and can cause death.
A healthcare provider may provide antiviral medication for people with chickenpox who are more likely to develop serious disease:
Call your healthcare provider immediately if you or your child develop any of the following symptoms: