• Dongwon Yoon, Ju Hwan Kim, Hyesung Lee, and Ju Young Shin.
• School of Pharmacy, Sungkyunkwan University, Suwon, Korea.
• Yonsei Med. J. 2020 Jul 1; 61 (7): 623-630.

PurposeVaccine hesitancy is among the top ten threats to global health, and access to precise data on adverse events following immunization (AEFIs) is imperative to alleviate public concerns surrounding vaccines. This study aimed to present the overall trends of AEFIs reported in South Korea.Materials And MethodsWe evaluated the trends of AEFIs using the Korea Institute of Drug Safety & Risk Management-Korea Adverse Event Reporting System database between January 2005 and December 2017. AEFIs were classified into five categories to evaluate associations between vaccines and AEFIs through a case-non-case study: neurologic reactions, general systemic reactions, local reactions, allergic reactions, and others.ResultsAmong 54378 reported adverse events (AEs) associated with all vaccines approved in South Korea, more than half (56.7%) occurred following influenza vaccination, followed by the pneumococcal (11.6%) and Bacillus Calmette-Guérin (BCG) vaccines (5.0%). After immunization with most vaccines, general systemic reactions were most common, followed by local and neurologic reactions. Adjusted reporting odds ratios were calculated for all neurologic, general, local, and allergic reactions: of all vaccines, rotavirus [neurologic 2.43, 95% confidence interval (CI), 2.25-2.62], BCG (general; 2.20, 95% CI, 1.91-2.53), BCG (local; 3.15, 95% CI, 2.69-3.68), and Japanese encephalitis (allergic 2.38, 95% CI, 1.98-2.87) vaccines showed the highest values.ConclusionThe majority of reported AEFIs were non-serious and mostly general systemic reactions. Sufficient knowledge on the AEFIs would secure public confidence on the safety of vaccines, thereby reducing public health burden from vaccine-preventable diseases.© Copyright: Yonsei University College of Medicine 2020.

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