Communication Intervention to Improve Influenza Vaccination Rates Among Elderly in Can Tho

This study evaluates the effectiveness of a multi-component community-based communication intervention to increase influenza vaccination rates among adults aged above 65 years in Can Tho City, Vietnam. Using a cluster randomised controlled trial design with stratified lottery randomisation, four study sites were selected from eight sites surveyed in a prior study: O Mon Ward and Truong Thanh Commune (intervention); Phuoc Thoi Ward and Truong Xuan Commune (control). The intervention includes community health education sessions, healthcare worker training, household visits, health communication banners, and Zalo-based vaccination reminders, delivered over 12 months (September 2025 to September 2026). Effectiveness is assessed by comparing pre- and post-intervention outcomes using Difference-in-Differences (DID) analysis.

NCT Number	NCT07508189
Lead Sponsor	Can Tho University of Medicine and Pharmacy Collaborators: National Institute of Hygiene and Epidemiology, Vietnam
Conditions	Influenza, Vaccination Coverage, Health Communication
Enrollment	1,200 participants
Start Date	2025-09-01
Primary Completion	2026-09 (estimated)
Study Completion	2026-12 (estimated)
Updated on ClinicalTrials.gov	2026-07-06