目的：台灣於2024-2025年首度推動「左流右新」政策，成功帶動新冠疫苗開打初期的接種率。然而，隨著疫情進入相對穩定階段，民眾風險感知與接種意願持續低落，加上疫苗安全性與有效性等資訊落差，急需創新模式提升資訊能見度與可近性，並優化實證傳遞與風險溝通。

方法：本研究回顧各國新冠風險評估工具，並整合國內監測數據與國際文獻中關於高風險族群的實證資料。以快速便利、實證導向、行動導向與個人場景導向為核心設計原則，開發針對台灣長者與慢性病患者等公費接種對象的本土化評估工具，並邀請專業人士評估工具之操作難易度、臨床實用性、病人接受度、自我信心影響等及民眾進行前導測試評估適用性。

結果：開發可由醫護詢問或民眾自填方式出線上「台灣成人新冠風險自我評估工具」，工具以年齡與共病因子等進行簡易評估以判別風險等級，並客製化呈現感染新冠後的重症與死亡相對風險等資訊。總計48位專家測試，認為工具操作簡易（平均9.5分，平均在34.0秒內完成）。優化後之評估工具經997位民眾使用者有超過75% (290/382)表示非常願意或願意接種。若進一步以風險族群分類，極高風險使用者為83% (121/146)，較高度風險使用者72% (169/236)為高(p=0.037)。

結論：本工具作為疫苗創新推動策略，可促使民眾察覺與理解自身風險，亦能輔助醫護人員提供具科學依據的衛教諮詢與接種建議以推動高風險族群接種疫苗，提升整體防疫成效。

Purpose: The initiation of the “Co-Admin: Left Flu, Right COVID” (“Co-Admin”) vaccination policy in Taiwan initially succeeded in boosting COVID-19 vaccine coverage during the 2024-2025 season. However, as the outbreak stabilized, persistent information gaps regarding disease risks and vaccine safety and effectiveness contributed to a gradual decrease in public risk perception, vaccination intention and uptake. This underscored the urgent need for user-centered, evidence-based risk communication strategies to enhance the visibility and accessibility of accurate and reliable information.

Methods: We reviewed international COVID-19 risk assessment tools and integrated local surveillance data with evidence from international literature regarding high-risk populations. Guided by the principles of speed, user-friendliness, evidence-based and actionable design, and contextual relevance, we developed a localized, web-based COVID-19 self-assessment tool targeting publicly funded co-admin vaccination priority groups in Taiwan, such as older adults and individuals with chronic conditions. Experts were invited to evaluate the tool for ease of use, clinical utility, patient acceptability, and impact on self-efficacy. A pilot evaluation was also conducted with the general public to assess applicability.

Results: The tool was developed for use by healthcare providers and for self-completion by users. By incorporating age and comorbidities to stratify risk levels, the tool provides personalized visualization of the relative risk of severe outcomes and mortality following COVID-19 infection. A total of 48 experts evaluated the tool, reporting high ease of use (mean score 9.5; mean completion time 34.0 seconds).

Among 997 general public users, 382 completed the vaccination intention assessment; of these, over 75% (290/382) expressed willingness to receive vaccination. When stratified by risk level, approximately 83% (121/146) of those at very high-risk expressed vaccination willingness, a significantly higher proportion than those at high risk (around 72%, 169/236; p=0.037).

Conclusion: This COVID-19 risk self-assessment tool represents an accessible, practical, and context-specific approach to promoting vaccination. By enhancing public risk awareness, it supports the healthcare professionals in delivering evidence-based health education and vaccine recommendations. Preliminary findings suggest the tool may increase vaccination willingness, particularly among very high-risk individuals, thereby strengthening public health protection.