Hi there I understand your concern...if you had chicken pox in your childhood yo will not get it as you will be having antibodies in your body....Vaccination is the best way to protect yourself against chickenpox. Nearly 100 percent of adults will develop protective antibodies against the chickenpox virus after two vaccine doses. Immunity from the vaccine is long-lasting and probably permanent in most people. People who were vaccinated against chickenpox may sometimes develop the disease but it is usually mild, with about 50 or fewer red bumps that rarely grow into blisters...