shingles

Once a person has had chickenpox, they are no longer susceptible to another person who has shingles. So you are safe.
After an individual has chicken pox, this virus lives near the nerves and is never fully cleared from the body. Certain circumstances, such as emotional stress, immune deficiency (such as from AIDs or chemotherapy), anyone taking immunosuppressive drugs, or with cancer, can reactivate the virus causing shingles. In most cases however, the cause for the reactivation of the virus is never found.

Shingles are contagious in certain circumstances. Shingles can be spread from the infected person to children or adults who have never had chickenpox. But, instead of developing shingles, the people who have not had chickenpox will develop chickenpox. Once these people have had chickenpox, they too have the potential to contract shingles later on in their lifetime.