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Herpes zoster (HZ) incidence rises with age, especially after 50 years of age, probably due to waning varicella-zoster virus (VZV)-specific immunity. The Shingles Prevention Study [Oxman MN, Levin MJ, Johnson GR, Schmader KE, Straus SE, Gelb LD, et al. A vaccine to prevent herpes zoster and postherpetic neuralgia in older adults, N Engl J Med 2005;352:2271–84], enrolled people ≥60 years of age and...