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Herpes Zoster is caused by the dormant varicella-zoster, also known as chickenpox, becoming active again, often years following the initial incidence of the infection. The dormant virus becomes active when the patient's immune system declines due to immunosuppression or ageing. [4] In Australia around 120,000 new cases of herpes zoster occur each year and account for approximately one in 1000 of all GP visits. 6,7 Although it can occur at any age after primary infection, the risk of herpes zoster and postherpetic neuralgia increases substantially from 50 years of age onward. 6 People who live to age 85 years have ...