摘要Objective Despite the global decrease in influenza infections during the coronavirus disease 2019(COVID-19)pandemic,seasonal influenza remains a significant health issue.South Korea,known for its robust pandemic response and high influenza vaccination rates,offers a unique context for examining changes in vaccination trends during the pandemic.Using nationally representative data,we aimed to understand the impact of the pandemic on influenza vaccination behavior over a 12-year period and to identify vulnerable groups.Methods We analyzed influenza vaccination rates in South Korea between 2011-2022,focusing on pandemic-related impacts.The data of 2,426,139 adults(≥19 years)from the Korea Community Health Survey were used to assess demographic and sociological factors influencing vaccination behaviors.Results We observed an increase in influenza vaccination rates during the pre-COVID-19 period from 2011-2013(weighted prevalence:46.68%[95%confidence interval(CI):46.55-46.82])to 2017-2019(weighted prevalence:52.50%[95%CI:52.38-52.63]).However,a significant decline was observed in 2022,the late-COVID-19 pandemic period(weighted prevalence:55.78%[95%CI:55.56-56.01]),compared with the mid-pandemic period in 2021(weighted prevalence:59.12%[95%CI:58.91-59.32]),particularly among populations traditionally prioritized for influenza vaccination,including older adults(≥65 years)and patients with chronic diseases and low educational and income levels.Conclusion The influenza vaccination rate in South Korea was significantly affected by the COVID-19 pandemic,showing a notable decrease among vulnerable demographic groups.This suggests the need for targeted public health strategies to address vaccine hesitancy and improve vaccination rates,particularly among high-risk populations.