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泰與印尼疫情失守引發陸疫苗效力質疑 BBC分析疫苗效力與外交目的 - 國際
香港大學公共衛生學院教授高本恩(Benjamin Cowling)解釋,接受2劑疫苗仍會爆發感染可能是因為多種因素使然。第一,與其他疫苗一樣,大陸疫苗也會因時間的推移而效力遞減。本週於泰國公布的一項研究顯示,接受兩劑科興疫苗的人,體內抗體每40天就下降一半。
其次,臨床實驗的樣本數過少,與真實世界的感染數字無法相比,這導致臨床實驗的效力放入真實世界中,結果大打折扣;特別是印尼,每日新增確診人數已破萬。
再者,也可能是因為Delta變種病毒更具傳染力。在印尼與泰國,確診者是因為Delta變種病毒而感染的比例分別為60%與26%。
目前仍缺乏大陸疫苗對抗任何變種病毒的公開數據;但初步研究指出,像國藥與科興疫苗使用的滅活病毒技術,對抗Delta變種病毒的效力可能比原始病毒少20%。
至於這兩款疫苗在大陸使用卻沒有傳 ....
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