Background. Herpes zoster (HZ) and postherpetic neuralgia (PHN) cause significant morbidity in older adults. The incidence and severity of HZ and PHN increase with age in association with an age-related decline in varicellazoster virus (VZV)-specific cell-mediated immunity (VZV-CMI). VZV vaccines can boost VZV-CMI. Therefore, we tested the hypothesis that VZV vaccination would protect older adults against HZ and PHN.Methods. We enrolled 38,546 adults у60 years of age in a randomized, double-blind, placebo-controlled trial of an investigational HZ vaccine and actively followed subjects for the development of HZ. The primary end point was the burden of illness due to HZ (HZ BOI), a composite measure of the incidence, severity, and duration of pain and discomfort caused by HZ. The secondary end point was the incidence of PHN.Results. Subject retention was 195%. HZ vaccine reduced the HZ BOI by 61.1% (95% confidence interval [CI], 51.1%-69.1%;) and reduced the incidence of PHN by 66.5% (95% CI, 47.5%-79.2%; ). The P ! .001 P ! .001 incidence of HZ was also reduced by 51.3% (95% CI, 44.2%-57.6%;). HZ vaccine was well tolerated; P ! .001 injection site reactions were generally mild. HZ vaccine neither caused nor induced HZ.Conclusion. The Shingles Prevention Study demonstrated that HZ vaccine significantly reduced the morbidity due to HZ and PHN in older adults.