The varicella vaccine protects against chickenpox (varicella), a common and very contagious childhood viral illness.
The varicella vaccine is given by injection when kids are between 12 and 15 months old. They receive a booster shot for further protection at 4 to 6 years of age.
Kids who are older than 6 but younger than 13 who have not had chickenpox also may receive the vaccine, with the two doses given at least 3 months apart.
Kids 13 years or older who have not had either chickenpox or the vaccine need two vaccine doses at least 1 month apart.
The varicella vaccine prevents severe illness in almost all kids who are immunized. It's up to 85% effective in preventing mild illness. Vaccinated kids who do get chickenpox generally have a mild case.
Serious reactions such as allergic reactions are extremely rare. Possible mild effects are tenderness and redness where the shot was given, fever, fatigue, and a varicella-like illness. A rash can occur up to 1 month after the injection. It may last for several days but will disappear on its own without treatment. There is a very small risk of febrile seizures after vaccination.
The vaccine is not recommended if:
Talk to your doctor about whether being vaccinated is a good idea if your child:
Your doctor may determine that the benefits of vaccinating your child outweigh the potential risks.
Pregnant women should not receive the chickenpox vaccine until after childbirth.
Pain and fever can be treated with acetaminophen or ibuprofen. Check with your doctor to see if you can give either medication and to find out the appropriate dose.
Call your doctor if:
Reviewed by: Elana Pearl Ben-Joseph, MD
Date reviewed: October 2012
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