Improving Rates of Outpatient Influenza Vaccination Through EHR Portal Messages and Interactive Automated Calls: A Randomized Controlled Trial.

Background: Patient reminders for influenza vaccination, delivered via electronic health record (EHR) patient portal messages and interactive voice response (IVR) calls, offer an innovative approach to improving patient care.

Objective: To test the effectiveness of portal and IVR outreach in improving rates of influenza vaccination.

Design: Randomized controlled trial of EHR portal messages and IVR calls promoting influenza vaccination.