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Zoster Information

A reported history of zoster does not preclude vaccination, as repeat episodes of zoster have been confirmed in immunocompetent persons.

The exact risk for and severity of zoster after a previous episode are unknown, but some experts believe it may be similar to those with no history of zoster.

There is no laboratory test to confirm previous zoster infection, and reports of previous episodes may be erroneous.

Although the safety and efficacy of zoster vaccine have not been assessed in persons with a history of zoster, additional safety concerns are not expected in this group.