磐石艦事件差一點成為台灣防疫的大破口，國內媒體屢屢將其與同樣「軍艦染疫」的美國羅斯福號、法國戴高樂號等艦艇比較，並使用「侵襲率」一詞來形容艦上染疫的程度。請見下列新聞標題：
〈磐石艦侵襲率9% 遠低於美、法艦〉
Photo/graphic: Liberty Times May 5, 2020／照片：自由時報2020年5月5日
Photo/GRAPHIC courtesy of Bookman l 圖片:書林
什麼是「侵襲率」？其實就是「罹患率」(attack rate)！
Wikipedia 英文版 attack rate 的解釋十分簡明，節錄如下：
Attack rate
Photo/GRAPHIC courtesy of Bookman l 圖片:書林
In epidemiology, the attack rate is the percentage of the population that contracts the disease in an at-risk population during a specified time interval.
罹患率在流行病學中是指該流行病爆發的一段時間內，曝險人群感染疾病累積的發病率。算法是由一段時間內，某個暴露在患病風險的群體內的新病例，除以整個群體的人數。
以磐石艦為例，艦上有377人，在出任務至回台確診這段期間，總共35人發病，因此得出罹患率(attack rate) 9%的數字，而法國戴高樂號，在COVID-19爆發時，採檢約2000人，有1040人感染，所以罹患率約為52%。
Photo/GRAPHIC courtesy of Bookman l 圖片:書林
罹患率會隨著調查不同時間內的不同群體而有所差異，據此可以讓公衛專家評估是哪些因子影響罹患率高低，比如戴或不戴口罩、室內空氣流通與否、是否共用餐具、浴廁，有無密切接觸和群聚等，進而在尚未罹患、發病的群體中進行預防。磐石艦與戴高樂號、羅斯福號同樣屬於人員密切接觸的軍艦，罹患率比鑽石公主號等空間寬敞的船隻還低，實屬不幸中的大幸。
文章由書林出版公司提供：
www.bookman.com.tw
蘇正隆 — 台灣翻譯學學會前理事長、師大翻譯研究所兼任副教授; 編著《英語的對與錯》，《世紀病毒：必讀防疫英文知識與詞彙》...等
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