傳統的風險溝通，如酒駕、慢性病、藥物濫用等，多可在較長期、緩慢背
景下進行，傳播者有足夠時間規劃與測試訊息，使其傳播效果最佳化，面對如 COVID-19 這類緊急公衛危機的迫切性，如何將過往慢性風險溝通形式，轉化 成可迅速改變人們態度行為的訊息訴求，將是一大挑戰。
危機傳播強調回應公眾對訊息需求的即時性‧但危機發生時也可能有額外 風險，需要透過有效的說服性訊息應對危機的緊迫性，這使得風險和危機傳播 有融合的必要性。為了在緊迫、威脅和高度不確定性的背景下有效溝通， Reynolds 和 Seeger(2005)提出危機和緊急風險溝通理論模型(Crisis and Emergency Risk Communication, CERC)，以提供緊急公衛危機有效的指引。
COVID-19 爆發後，社交媒體上混雜大量疫情資訊，為了更有效地在社交 媒體上與公眾溝通，各國政府公衛組織多以更易於理解且可快速分享的視覺化 內容傳播，其影響力並不低於新聞文本或是純文字的推文，卻未被充分探討。 鑑於上述理論和實證的缺失，本研究以 2022 年台灣 Omicron 變異株危機為例， 借鑑 CERC 的理論框架，探討政府公衛部門在疫情不同階段的溝通策略，能否 讓公眾理解並有效應對這場公衛危機。
本研究發現政府公衛機構在訊息主題上，並無因應疫情變化，調整其訊息
內容，多停留在疫情初期的防疫宣導，未即時提供更符合公眾當前需求的主題;在視覺形式上，政府公衛機構多以文字卡呈現，缺乏能讓公眾快速理解並提高其風險感知的圖表，且常以明顯視覺符號，如紅字、粗體引導公眾關注較不重要的資訊，或刻意以不明顯字體使公眾無法察覺特定資訊的可能性。
本研究在視覺層面的分析補足過往 CERC 理論中僅提供訊息指引的限制， 並以 Omicron 變異株的風險和危機特徵為例，提出未來政府公衛機構在緊急公 衛危機期間視覺化溝通策略上的建議。

Traditional risk communication, such as drunk driving, chronic diseases, and drug abuse, can be carried out in a longer-term and slower context where communicators have enough time to plan and test messages to optimize their effectiveness.
Crisis communication emphasizes the immediacy of responding to the public's need for information. The need to respond to the urgency of a crisis through effective persuasive messaging makes it necessary to integrate risk and crisis communication. To communicate effectively in a context of urgency, threat, and high uncertainty, Reynolds and Seeger (2005) proposed the Crisis and Emergency Risk Communication (CERC) theoretical model to provide effective guidance for emergency public defense crises. To communicate more effectively with the public on social media after the outbreak of COVID-19, public health organizations in various countries have been using visual content that is easier to understand and can be shared quickly, with no less impact than news texts or text-only tweets but has not been fully explored. Because of these theoretical and empirical deficiencies, this study uses the 2022 Omicron strain crisis in Taiwan as an example and draws on the theoretical framework of CERC to investigate whether the communication strategies of government public health departments at different stages of the epidemic can enable the public to understand and effectively respond to this public health crisis.
This study found that government public health agencies did not adjust their message contents in response to the changes of the epidemic, and mostly stayed at the initial stage of the epidemic to promote epidemic prevention, without providing topics that could better meet the current needs of the public. They often use obvious visual symbols, such as red letters and bold fonts, to guide the public to focus on less important information, or deliberately use obscure fonts to make the public unaware of the possibility of specific information.
The visual analysis in this study complements the limitations of previous CERC theories that only provide information guidance, and uses the risk and crisis characteristics of the Omicron variant as an example to suggest future visual communication strategies for governmental public health agencies during emergency public health crisis.

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