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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
SINGLE
Enrollment
228,831
Patients will receive up to 3 text messages reminding them about the importance of influenza vaccination during the 2022-2023 flu season.
Los Angeles County Department of Health Services
Los Angeles, California, United States
Number of Participants Vaccinated at the End of the Campaign Period
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.
Time frame: 6 months
Heterogeneity of Treatment Effects for Demographics
Heterogeneity of treatment effects for demographic groups (previous vaccination status: vaccinated or unvaccinated)
Time frame: 6 months
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