Early and Late Influenza Vaccine Effectiveness in South Korea During the 2023-2024 Season.

ABSTRACT:

Background

During the 2023-2024 season, the influenza epidemic in South Korea peaked earlier, and the influenza vaccination rate among individuals aged ≥ 65 was high (82.2%). However, data on real-world vaccine effectiveness against influenza are lacking.

Methods

From November 2023 to April 2024, we conducted a multicenter retrospective case-control study on adult patients aged ≥ 18 years who presented with influenza-like illness at seven medical centers as a part of a hospital-based influenza morbidity and mortality surveillance (HIMM) program in South Korea. Demographic and clinical data were collected from questionnaire surveys and electronic medical records. Using a test-negative design, we assessed the effectiveness of the 2023-2024 seasonal influenza vaccine, with age,

SUBMITTER: Choi YJ 

PROVIDER: S-EPMC11861641 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature