Sarcouncil Journal of Internal Medicine and Public Health

Abstract: Background: Measles outbreaks have continued to occur in several localities despite high vaccination coverage, suggesting that certain risk factors still contribute to disease transmission. Objective: To analyze some factors associated with measles infection in Dak Lak Province, Vietnam, during 2024–2025. Methods: A cross-sectional analytical study was conducted using epidemiological surveillance data. The analyzed factors included sex, age group, area of residence, vaccination history, exposure, and travel history. Associations were examined using odds ratios (ORs) with 95% confidence intervals (CIs). Results: The risk of measles infection was higher among unvaccinated individuals, those with a history of contact with confirmed cases, those who had traveled within three weeks before disease onset, and those residing in outbreak areas compared with other groups. Multivariate analysis indicated that incomplete vaccination and exposure history were the principal risk factors. Conclusion: Incomplete vaccination and close contact with measles cases were identified as the leading risk factors. Strengthening vaccination coverage, improving contact surveillance, and implementing early community interventions are necessary to reduce outbreaks.