Kaiser Colorado Flu Nudge

NCT07372950 | Active Not Recruiting

• 1 other identifier: 2368690-1
• Study Type: interventional
• Target: 100,000
• Locations: 1 country
• Sites: 1

Brief Summary

Influenza infection leads to significant morbidity and mortality each year. Influenza vaccines can reduce the risk of flu and the severity of flu illness, In addition, flu vaccinations can reduce flu complications such as pneumonia or worsening of chronic heart or lung disease. Each year, Kaiser Permanente of Colorado offers influenza vaccines to patients at no cost either at primary care clinic appointments or flu walk-in clinics in the fall prior to the upcoming flu season. In addition, as part of clinic appointment reminder text messages, there is a message to get the flu vaccine for patients who have not received the vaccine prior to the clinic visit. Building on these flu reminder text messages for patients who have not received a flu vaccine, this study will test different behavioral nudge text messages to improve influenza vaccination rates.

Conditions

Influenza; Vaccination

Keywords

influenza; vaccination; text messages; behavioral change

Outcome Measures

Primary Outcomes (1)

• Receive flu vaccine

  Did the patient receive a flu vaccine as denoted from the EMR. The vaccine could have occurred within Kaiser Permanente Colorado or outside of Kaiser Permanente Colorado and in which Kaiser received information about the flu vaccination during the flu season 2025-2026.

  12 weeks following receipt of first text message reminder

Secondary Outcomes (1)

• Time to flu vaccination

  12 weeks following receipt of 1st text message reminder

Study Arms (3)

Generic text messages

ACTIVE COMPARATOR

Patients will receive the usual flu vaccine text message reminder

Behavioral: Behavioral economics framed test messaging

Positively framed

EXPERIMENTAL

Patients will receive a positively framed text message to get the flu vaccine

Behavioral: Behavioral economics framed test messaging

Convenience framed

EXPERIMENTAL

Patients will receive a convenience framed text message to get the flu vaccine

Behavioral: Behavioral economics framed test messaging

Interventions

Behavioral economics framed test messaging BEHAVIORAL

We will use positive framing and convenience framing as our 2 behavioral text messages to improve flu vaccination rates.

Convenience framed; Generic text messages; Positively framed

Eligibility Criteria

• Age: 6 Months+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients 6 months and older who have not received a flu shot at the time of their primary care clinic appointment reminder will be eligible to receive a flu vaccine reminder text message. For children \<18 years of age, their caregiver will receive the text message

You may not qualify if:

• Patients not eligible for flu vaccine

Sponsors & Collaborators

• Kaiser Permanente: lead

Study Sites (1)

Institute for Health Research

Aurora, Colorado, 80011, United States

Location

MeSH Terms

Conditions

Influenza, Human

Condition Hierarchy (Ancestors)

Respiratory Tract Infections; Infections; Orthomyxoviridae Infections; RNA Virus Infections; Virus Diseases; Respiratory Tract Diseases

Study Officials

• Michael Ho, MD, PhD

  Kaiser Permanente

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: HEALTH SERVICES RESEARCH
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Medical Director of IMPROVE

Study Record Dates

• First Submitted: October 1, 2025
• First Posted: January 28, 2026
• Study Start: October 6, 2025
• Primary Completion (Estimated): June 1, 2026
• Study Completion (Estimated): September 1, 2026
• Last Updated: January 28, 2026

Record last verified: 2026-01

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)