Conversational AI for Adult Flu Vaccination Decisions

This randomized trial tests whether an online guide combining short evidence cards with an AI-guided conversation increases flu-vaccination intention among US adults who haven\'t decided whether to get a flu vaccine this season. Participants recruited through Prolific are randomly assigned to the flu guide or to a structure-matched guide about everyday accident safety. The primary outcome is self-rated likelihood of getting a flu vaccine this season (1-7), asked immediately after the session. Participants are asked at about 2 and 8 weeks whether they have been vaccinated. The study is powered for the intention outcome but not for vaccination. For vaccination, it estimates the effect, the base rate, and follow-up response, to size a later, larger trial.