Precision Vaccine Promotion in Underserved Populations

Previous studies have shown that low-cost, behavioral nudges through texting can increase influenza vaccination uptake compared to usual care. However, there are limited studies that evaluate the effect of decreasing barriers to scheduling, especially within safety net populations. The setting for this study, DHS, is the second largest public delivery system in the country and serves approximately half a million diverse patients that are eligible for vaccinations annually. This pilot study (one arm in a larger randomized controlled trial) will examine the effect of text messages highlighting MediCal health plan transportation resources (vs standard text messaging) on influenza vaccination rates in adults during the 2022-2023 flu season.

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Key information

Conditions

Influenza Behavior Health Behavior Infections Influenza, Human Orthomyxoviridae Infections RNA Virus Infections Respiratory Tract Diseases Respiratory Tract Infections Treatment Adherence and Compliance Treatment Refusal Vaccination Hesitancy Vaccination Refusal Vaccine Hesitancy Virus Diseases

Age range

6 month and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Los Angeles County Department of Health Services

Los Angeles, California, 90012, United States

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Los Angeles County Department of Health Services (LACDHS) primary care patients over 6 months of age

Exclusion criteria

LACDHS patients less than 6 months of age

Treatment and study plan

Text messaging

Behavioral

Patients will receive up to 3 text messages reminding them about the importance of influenza vaccination during the 2022-2023 flu season.

Primary outcomes

Number of Participants Vaccinated at the End of the Campaign Period

Time frame: 6 months

Number of Participants who received their influenza vaccination during the campaign period, as measured in the California Immunization Registry (CAIR2) to include vaccinations occurring both inside and outside the LADHS system. We assessed baseline vaccination status at the beginning of the flu season and excluded individuals who already received their vaccination.

Secondary outcomes

Heterogeneity of Treatment Effects for Demographics

Time frame: 6 months

Heterogeneity of treatment effects for demographic groups (previous vaccination status: vaccinated or unvaccinated)

Sponsors and collaborators

Lead sponsor

University of Southern California

Other

Collaborators

Los Angeles County Department of Public Health
National Institute on Aging (NIA)
University of California, Los Angeles

Registry information

Important dates

Study start: 2022
Primary completion: 2023
Study completion: 2023
First posted: Sep 13, 2022
Registry last updated: Oct 1, 2024

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed