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Purpose: In recent years, the world has been under threat of novel infectious diseases such as Middle East respiratory syndrome (MERS) and coronavirus disease 2019 (COVID-19) Governmental risk communication plays a key role in overcoming the public health crises caused by the emergence of these infectious diseases The purpose of this study was to identify the focus of Korean public service advertisements (PSAs) in response to the MERS and COVID-19 outbreaks, along with the differences between them Methods: A total of five MERS and 17 COVID-19 TV PSAs were analyzed using Lasswell\'s Sender, Message, Channel, Receiver, and Effect model and the responses of the Korean government were compared between the MERS and COVID-19 outbreaks Results: During the MERS outbreak, the Korean government failed to gain the public\'s trust through its PSAs Despite its best efforts, it provided opaque and selective information on the crisis Conversely, in the case of COVID-19, the Korean government has successfully worked to strengthen community awareness by supporting and encouraging the public Conclusion: Despite the Korean government\'s improved communication in the COVID-19 crisis, there has been an insufficient response to the needs of vulnerable groups that could be placed in at-risk situations as a result of domestic violence or mental health problems during outbreaks of novel infectious diseases that require aggressive management
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