- Conditions
- Influenza Vaccination, Health Promotion, Health Behavior, Risk Reduction
- Interventions
- Letter, Patient portal, SMS
- Behavioral
- Lead sponsor
- Geisinger Clinic
- Other
- Eligibility
- 18 Years and older
- Enrollment
- 43,225 participants
- Healthy volunteers
- Healthy volunteers not accepted
- Timeline
- 2022
- U.S. locations
- 1
- States / cities
- Danville, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 11, 2022 · Synced May 22, 2026, 1:12 AM EDT