Abstract
Increased awareness of adverse events following immunization (AEFI) can disrupt vaccination programs. In South Korea, a report of alleged influenza vaccine-related deaths attracted significant media attention in 2020. We retrieved the vaccination coverage and AEFI data to determine their association with media coverage. Between 2015 and 2019, the vaccination coverage rate ranged between 80.5% and 83.3%; however, the vaccination coverage rate declined significantly from 2020 to 2021 to 73.6% (p < 0.0001). During the 43rd week of 2020, following a large amount of media coverage on vaccine safety issues, the number of cases with AEFI reached 60. Between 2015 and 2020, the mortality rate ratios for influenza vaccines and non-vaccines ranged between 0.1296 (95% confidence interval (CI), 0.1262–0.1331, p < 0.0001) and 0.1608 (95% CI, 0.1572–0.1644, p < 0.0001). Vaccine safety surveillance should be continued in conjunction with investigation and transparent risk communication to maintain public trust in vaccines and vaccinations.
Highlights
Increased awareness of the adverse events following immunization (AEFI) may disrupt vaccination programs, which may lead to the resurgence of vaccine-preventable diseases [1]
We aimed to describe the trend of media coverage on vaccine safety alongside AEFI reporting and vaccination coverage rate and to examine the background mortality rates following influenza vaccination in the elderly population in South Korea
During the 43rd week of 2020, there was a large amount of media coverage on vaccine safety issues that framed the association between the influenza vaccine and the death of vaccinated individuals
Summary
Increased awareness of the adverse events following immunization (AEFI) may disrupt vaccination programs, which may lead to the resurgence of vaccine-preventable diseases [1]. We aimed to describe the trend of media coverage on vaccine safety alongside AEFI reporting and vaccination coverage rate and to examine the background mortality rates following influenza vaccination in the elderly population in South Korea. This retrospective study aimed to examine the (1) ecological changes in vaccine coverage in respective seasons and (2) the differences in mortality between vaccinated and unvaccinated individuals over the past six influenza seasons
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