Chickenpox immunization: Immunization designed to prevent or lessen the severity of the common disease known as chickenpox. The vaccination currently involves two shots, the first dose (shot) at age 12 through 15 months and the second dose (shot) at age 4 through 6 years. The second dose may be given at an earlier age if it is given at least 3 months after the first dose. People 13 years of age and older who have never had chickenpox or received chickenpox vaccine should get two doses, at least 28 days apart.
Chickenpox vaccination is especially important for health care professionals, people who care for or are around others with weakened immune systems, teachers, child care workers, residents and staff in nursing homes and residential settings, college students, inmates and staff of correctional institutions, Military personnel, non-pregnant women of child-bearing age, adolescents and adults living with children, international travelers. There have been few significant reactions to the chickenpox vaccine. All children, except those with a compromised immune system or a known neurological condition, should have the vaccination.