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Approximately one million new cases of shingles (herpes zoster [HZ]), a severely painful and debilitating disease caused by reactivation of varicella-zoster virus (VZV), occur in the United States each year. HZ incidence increases with age, especially after age 50. A vaccine to prevent HZ and its sequelae was licensed in May 2006 for those aged 60 years or older, making it the first new vaccine targeted...
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