Vaccination Nudges From Pharmacists

The goal of this individual-level pragmatic randomized policy trial is to learn about the impact of behavioural nudges via mailed letters on increasing influenza and travel vaccination uptake in Alberta, Canada. The primary outcome is the proportion of adults receiving influenza and/or travel vaccination. The secondary outcome is the number of stroke events in the 6 months following vaccination. As such, this research aims to answer two key questions: 1. Do behavioural nudges increase influenza and travel vaccination in Alberta? 2. If yes, is there a decrease in the number of stroke events in the 6 months following vaccination? The two-arm individual level pragmatic randomized trial design includes two letter dimensions, a letter (a "nudge") with an influenza and cardiovascular risk reduction message and a letter with a travel vaccination benefit message, yielding the following groups: Letter with an influenza and cardiovascular risk reduction message Letter with a travel vaccination benefit message