Interactive, Narrative-Based Digital Health Interventions for Vaccine Communication: Scoping Review

<b>Background:</b> Interactive, narrative-based digital health interventions may positively influence vaccination-related attitudes, intentions, and uptake. However, evidence on their implementation and evaluation for vaccine communication has not yet been comprehensively synthesized. Our research questions (RQs) were to describe the use of interactive, narrative-based digital health interventions for vaccine communication (RQ1), their impact on individuals' vaccine intention or uptake (RQ2), and factors associated with their implementation (RQ3). <b>Methods:</b> A scoping review was conducted using Arksey and O'Malley's 5-stage framework and the PRISMA-ScR guidelines. We searched PubMed, Embase, Scopus, Web of Science, CINAHL, and PsycINFO from inception to 18 April 2023. To be included in the review, studies had to include empirical findings from primary data collection, address vaccine communication, use narrative communication that enabled audience engagement (i.e., interactivity), and deliver the narrative through a digital health device or modality. <b>Results:</b> The search identified 6834 records, with 25 studies meeting the inclusion criteria. For RQ1, the interventions most often focused on HPV vaccination (12 studies). Communication objectives included addressing vaccine hesitancy and increasing vaccination confidence or knowledge. Intervention delivery formats included multi-device compatibility (utilizing more than one device type, 7 studies) and incorporated interactive features, such as gamification and push notifications. Invented narratives were the most frequent narrative approach (8 studies). For RQ2, vaccination outcomes were reported in nearly half the studies (12 studies), with vaccination intention assessed in 8 studies and both vaccination intention and uptake assessed in 4 studies. For RQ3, implementation factors were reported in nearly half the studies (12 studies), with the most frequently reported outcome being acceptability (6 studies). <b>Conclusions:</b> Evidence supporting interactive, narrative-based digital health interventions for vaccine communication can be strengthened by diversifying narrative strategies, expanding the range of interactivity modalities tested, and focusing on a broader range of vaccines. Further research is needed to assess the effectiveness of these interventions, particularly of vaccine uptake. The insights from this scoping review may inform the development of novel future interventions for vaccine communication. The generalizability of these findings may be limited by the small number of studies in some categories and the preponderance of studies from high-income settings.