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Hwa Yeon Ko 1 Article
Barriers to COVID-19 vaccine surveillance: the issue of under-reporting adverse events
Yunha Noh, Hwa Yeon Ko, Ju Hwan Kim, Dongwon Yoon, Young June Choe, Seung-Ah Choe, Jaehun Jung, Ju-Young Shin
Epidemiol Health. 2023;45:e2023054.   Published online June 7, 2023
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AbstractAbstract AbstractSummary PDFSupplementary Material
This study investigated the reporting rates of adverse events following immunization (AEFIs) to the spontaneous reporting system (SRS) and its predictors among individuals with AEFIs after coronavirus disease 2019 (COVID-19) vaccination.
A cross-sectional, web-based survey was conducted from December 2, 2021 to December 20, 2021, recruiting participants >14 days after completion of a primary COVID-19 vaccination series. Reporting rates were calculated by dividing the number of participants who reported AEFIs to the SRS by the total number of participants who experienced AEFIs. We estimated adjusted odds ratios (aORs) using multivariate logistic regression to determine factors associated with spontaneous AEFIs reporting.
Among 2,993 participants, 90.9% and 88.7% experienced AEFIs after the first and second vaccine doses, respectively (reporting rates, 11.6 and 12.7%). Furthermore, 3.3% and 4.2% suffered moderate to severe AEFIs, respectively (reporting rates, 50.5 and 50.0%). Spontaneous reporting was more prevalent in female (aOR, 1.54; 95% confidence interval [CI], 1.31 to 1.81); those with moderate to severe AEFIs (aOR, 5.47; 95% CI, 4.45 to 6.73), comorbidities (aOR, 1.31; 95% CI, 1.09 to 1.57), a history of severe allergic reactions (aOR, 2.02; 95% CI, 1.47 to 2.77); and those who had received mRNA-1273 (aOR, 1.25; 95% CI, 1.05 to 1.49) or ChAdOx1 (aOR, 1.62; 95% CI, 1.15 to 2.30) vaccines versus BNT162b2. Reporting was less likely in older individuals (aOR, 0.98; 95% CI, 0.98 to 0.99 per 1-year age increment).
Spontaneous reporting of AEFIs after COVID-19 vaccination was associated with younger age, female sex, moderate to severe AEFIs, comorbidities, history of allergic reactions, and vaccine type. AEFIs under-reporting should be considered when delivering information to the community and in public health decision-making.
Korean summary
본 연구는 국내 19-49세 성인을 대상으로, 코로나19 예방 백신 접종 후 이상반응 경험에 대한 자발적 보고율을 조사하고, 자발적 보고와 관련된 요인을 파악하고자 하였다. 2021년 12월 2일부터 20일까지 온라인 설문조사를 통하여 자료를 수집하였으며, 연구대상자는 코로나19 예방 백신의 기초접종을 완료한 후 2주 경과한 19-49세 성인으로, 전국 대표성을 확보하기 위해 성별, 연령, 지역별로 층화하여 모집하였다. 이상반응 자발적 보고율은 1차 접종과 2차 접종 후 각각 약 11.6%, 12.7%로 나타났으며, 중등도에서 중증의 이상반응에 대한 자발적 보고율은 약 50.5%, 50.0%로 나타났다. 이상반응 자발적 보고율 관련 영향요인으로는 젊은 연령층, 여성, 이상반응의 중증도, 동반질환, 알러지 반응 이력, 기초접종 백신 종류가 포함되었다.
Key Message
Spontaneous reporting rates of adverse events following immunization (AEFIs) against coronavirus disease 2019 (COVID-19) were low, at around 12 % of any AEFIs and 50 % of moderate-to-severe AEFIs. Younger age, female sex, severe AEFIs, comorbidities, history of allergic reactions, and the type of COVID-19 vaccine were associated with the AEFIs reporting.


Citations to this article as recorded by  
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    Anbukkani Subbian, Jeevithan Shanmugam, Uma Ram
    Indian Journal of Obstetrics and Gynecology Research.2024; 11(1): 70.     CrossRef

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