Promoting Flu Vaccination Through a Mobile Wellness Program

Short messages (100-250 characters) are to be delivered to a mobile app both by push notification (i.e., appearing on the phone dashboard like a text message if the user has allowed notifications from the app) and in-app messages (visible in the news feed of the wellness program app when the app is opened). Messages contain a short title (30 characters) and 2-3 lines of text in the body (30 characters each).