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。577Please respect copyright.PENANAcrnUK6Nw3C
577Please respect copyright.PENANAg4BqL9W6gP
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。577Please respect copyright.PENANAzdi3vkyPSH
577Please respect copyright.PENANAEzSNzc5EmU
而我們身體對抗武肺病毒的手段,大致上可分成為兩種。577Please respect copyright.PENANAk7CGTnu28T
577Please respect copyright.PENANAEKD1YcgPuE
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。577Please respect copyright.PENANAb3DCs7vNix
577Please respect copyright.PENANA8eYkdIvoKj
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。577Please respect copyright.PENANAMgYL8HV70m
577Please respect copyright.PENANAF0yc3cWUYQ
「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。577Please respect copyright.PENANA3VUKpWx2ur
577Please respect copyright.PENANAif1O5bDUu3
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。577Please respect copyright.PENANATepoKV3MSD
577Please respect copyright.PENANALkkbzWDEox
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。577Please respect copyright.PENANAy7hYgrHtWC
577Please respect copyright.PENANATVm71G9g1B
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。577Please respect copyright.PENANAGpBVvJfoSF
577Please respect copyright.PENANADYbCAE4hmQ
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。577Please respect copyright.PENANAOz191Me7xe
577Please respect copyright.PENANAueA8hUrMqN
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。577Please respect copyright.PENANAdk3o5vNMbV
577Please respect copyright.PENANAdVe0YSL9tS
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。577Please respect copyright.PENANAZULaXb6BAJ
577Please respect copyright.PENANA803WAAtsyR
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。577Please respect copyright.PENANApwevbOAgNU
577Please respect copyright.PENANAy1zT6OwSoN
Ref1:https://www.biorxiv.org/content/10.1101/2021.01.28.428665v1.full.pdf577Please respect copyright.PENANAHG1xDgr9GZ
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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