現今不少的武肺疫苗在打上第一劑後,隔一段時間後便需打上第二劑,用意是希望增強身體的免疫系統反應,訓練免疫系統細胞記認武肺病毒的組件。578Please respect copyright.PENANAC8clOOSwuR
578Please respect copyright.PENANAhmgyI033wx
情形就像是強迫免疫細胞重覆溫習課本,當考試(武肺病毒)來臨的時候,免疫細胞亦懂得妥善應對。578Please respect copyright.PENANAPvpdX33k6E
578Please respect copyright.PENANATFvxSgbtRU
而我們身體對抗武肺病毒的手段,大致上可分成為兩種。578Please respect copyright.PENANAO1Y63euUjs
578Please respect copyright.PENANAQYhXp5qrNl
第一種手段就是在體內產生具中和性的抗體,當具中和性的抗體與病毒結合後,一來可以阻止病毒入侵身體細胞,二來亦可幫忙標示病毒的存在,讓某類別的免疫細胞前來消滅病毒。578Please respect copyright.PENANA7DCLUiQqDC
578Please respect copyright.PENANAHRCYSIG4Ii
而第二種手段,就是摧毀已被病毒感染的細胞,這工作交由對應武肺病毒的CD8+T免疫細胞負責。578Please respect copyright.PENANAi0FfgApg2m
578Please respect copyright.PENANA2ERPd1PFkG
「有趣」的是,現今的mRNA疫苗(Moderna以及輝瑞),在協助身體製作抗體(第一種手段)方面,相對上較為優勝於牛津疫苗。578Please respect copyright.PENANAoR4yuv7FK8
578Please respect copyright.PENANAw1c6Yt6Gqh
但是,在催谷身體生產對應武肺病毒的CD8+T免疫細胞(第二種手段)方面,牛津疫苗卻比mRNA疫苗優勝。578Please respect copyright.PENANAafsszy0XJg
578Please respect copyright.PENANAIsuHuPh9l7
至於中國製的疫苗,因為至今尚未有明確的數據,暫時略為難以比較。578Please respect copyright.PENANA7unnLF8xt2
578Please respect copyright.PENANAHdg80M57Ne
無論如何,基於mRNA疫苗及牛津疫苗在應對武肺病毒方面各有千秋,不其然便會讓人生起兩者各打一劑是否會效果更好的念頭。578Please respect copyright.PENANAdiR8qCaufB
578Please respect copyright.PENANASvYePiJ7oc
有科學家嘗試在老鼠身上作實驗,分別比較兩劑RNA疫苗、兩劑牛津疫苗、一劑RNA一劑牛津疫苗的成效,兩劑相隔的時間為4星期。578Please respect copyright.PENANAKxyCdKBQVT
578Please respect copyright.PENANAQxRHgWgwZO
報告在1月29日率先刊登在未經學術同輩審查的期刊上(Ref1),得出的結果是,注射一劑RNA一劑牛津疫苗的老鼠體內,其抗體(第一種手段)及CD8+T免疫細胞(第二種手段)含量均比另外兩種組別為高。578Please respect copyright.PENANAHqHLYYzTNM
578Please respect copyright.PENANAKeHj1MJIVd
大概是建基於這研究結果,牛津大學宣佈在2月4日起招募820人進行一劑輝瑞mRNA疫苗及一劑牛津疫苗的人體測試,一組人將會相隔4星期注射第二劑,另一組人則相隔12星期注射。578Please respect copyright.PENANA9mdSLnnVIm
578Please respect copyright.PENANAjsclWnaYNg
研究目的是希望檢驗這方法的安全性,以及體內產生抗體和CD8+T免疫細胞的效率,預期會在六月公佈結果。578Please respect copyright.PENANANk2uV6HDgT
578Please respect copyright.PENANAivRLrTPEc3
Ref1:https://www.biorxiv.org/content/10.1101/2021.01.28.428665v1.full.pdf578Please respect copyright.PENANAihK73q4owg
Ref2:https://www.nature.com/articles/d41586-021-00315-5
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科普專欄–薯不揀單
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #153
將兩款武肺疫苗各打一劑,是否可行?
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