Anyone who has had chicken pox can develop herpes zoster. Also known as shingles or zoster, herpes zoster is caused by the same virus as chicken pox. After the chicken pox clear, the virus remains dormant (inactive) within certain nerve cells of the body. When the virus reactivates, zoster, which can be quite painful, develops.

About 20 percent of people who have had chicken pox will get zoster. Most develop zoster only once.

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