港大及中大初步研究發現打兩針科興部分人中和抗體水平不理想

375名已完成2劑科興接種的人士，有至少80人接種一個月後，產生可預防有症狀感染的B細胞抗體反應「好弱」；不過，減少感染後嚴重及死亡情況的T細胞抗體水平，則與接種復必泰人士相若。

許樹昌表示，現仍未知接種兩劑科興後，部分人產生抗體水平較弱的原因，團隊本月中將陸續安排有關人士，同樣分兩組接種第3劑復必泰或科興疫苗，以分析當中原因，並了解打第3劑疫苗後的抗體反應，估計最快10月初會有初步數據，屆時或會向當局提交接種第3劑的建議。

食衞局局長陳肇始日前指研究需接種第3劑疫苗的群組；衞生防護中心疫苗可預防疾病科學委員會主席劉宇隆上周稱，本港料需至秋冬季，待全球有更多數據支持，及本港達7至8成接種率時才考慮需否接種第3劑。

港大研究:

接種兩針復必泰（BioNTech）的平均抗體水平較兩針科興者高約9倍。即使只打一針復必泰的平均抗體水平，亦高過打兩針科興者逾八成。領導研究的專家高本恩（Benjamin John Cowling）指出，如要減低感染風險保護身邊人，宜選復必泰，讓無打針者受群體免疫保護。

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