Preventing Chickenpox

Doctors recommend that kids receive the chickenpox vaccine when they are 12 to 18 months old. The vaccine is about 70% to 85% effective at preventing mild infection, and more than 95% effective in preventing moderate to severe forms of the infection. Although the vaccine works pretty well, some kids who are immunized still will get chickenpox. Those who do, though, will have much milder symptoms than those who haven't had the vaccine and become infected.

Healthy children who have had chickenpox do not need the vaccine — they usually have lifelong protection against the illness.