2656. Eliciting Preferences for Zoster Vaccination in US Adults Aged 50 Years and Older.

Background In October 2017, the Centers for Disease Control and Prevention (CDC) recommended the adjuvanted Recombinant Zoster Vaccine (RZV) for all adults aged ≥ 50 years, regardless of previous vaccination. Understanding patient preferences for herpes zoster (HZ) vaccination can inform providers, payers, and policymakers about barriers, hesitancies, and utilization of available vaccines. Methods A discrete choice experiment survey was completed by 1,454 US adults aged ≥50 years in January 2019, with targeted sampling quotas of African Americans (25%), recent influenza vaccine recipients (50%), and individuals with autoimmune disease or chronic comorbidities (37%), to enable subgroup analyses. HZ vaccine profiles were characterized using seven attributes: vaccine efficacy (VE), duration of protection, location of service, number of doses, injection-site reaction severity, systemic reactions duration, and out-of-pocket (OOP) costs. In a series of choice questions, respondents chose between a pair of hypothetical HZ vaccine profiles, determined by an efficient experimental design, and a no vaccination option. In a second series, respondents stated intentions to complete a 2-dose vaccination series, conditioned on varying levels of side effects experienced with a first dose and expected OOP costs. Differences across subgroups were explored. Results Respondents placed the greatest weight on OOP costs and VE when choosing among HZ vaccination options (Figure 1). African American respondents were more sensitive to increases in OOP costs than non-African American respondents (Figure 2). ~75% of respondents indicated they would complete the series of a two-dose HZ vaccine if the cost of completing the series was $8-$13. Second-dose compliance drops about 25% when OOP costs increase to $140–150. Conclusion OOP cost had the greatest influence on respondents' intention to select and complete HZ vaccination. Efforts to remove financial barriers to improve implementation of the CDC recommendations for HZ vaccination should be considered. GlaxoSmithKline Biologicals SA, GSK study identifiers: 208677/HO-17-18066. Disclosures All authors: No reported disclosures. [ABSTRACT FROM AUTHOR]