Extended Herpes Zoster Vaccine Effectiveness in a Health Maintenance Organization
The objectives of this study are to conduct a retrospective cohort study to evaluate the long-term effectiveness of the zoster vaccine for preventing HZ and PHN among persons 60 years of age or older. Understanding the long-term duration of vaccine effectiveness will be critical for monitoring impact of the zoster vaccination program, as well as for informing policy decisions that the ACIP will face, such as the consideration of a booster dose, and determining the optimum age to begin vaccination.