Varicella-zoster virus

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Varicella-zoster virus, The varicellazoster virus (VZV) can cause two diseases: chickenpox (varicella) and shingles (herpes zoster). Before a vaccine was developed in 1994, chickenpox was a common contagious childhood disease that produced itchy blisters but rarely caused serious problems. However, if adults who had not had the disease as children contracted it, it could cause more serious complications.Shingles is caused by a reactivation of the virus that causes chickenpox. Once you have had chickenpox, the varicella-zoster virus lies dormant in your nerves and can re-emerge as shingles. Shingles, which is characterized by a rash of blisters, can be very painful but is not life-threatening. Some people who develop shingles also develop a condition caused postherpetic neuralgia, which causes the skin to remain painful even after the rash is gone. Shingles is most common in people over 60 or in those with a weak immune system. A vaccine is available that reduces your risk of getting shingles.

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