Real-World Effectiveness of Egg-Based Inactivated Influenza Vaccines Against Influenza Among Children Aged 6–59 Months During the 2025/26 Season in Shenzhen Area, China: A Retrospective Cohort Study
Background: Young children are at high risk of influenza and its complications, yet evidence on the real-world effectiveness of egg-based inactivated influenza vaccines in children aged 6–59 months remains limited during antigenically drifted seasons. Methods: We conducted a population-based retrospective cohort study...