香港政府發板決定購置輝瑞及科興武肺病毒疫苗,林鄭月蛾及一眾首長斷言會率先注射,以身展示疫苗的安全性。1157Please respect copyright.PENANAlbVl4K55fs
1157Please respect copyright.PENANATlYv7AiKrc
本文章將綜合中國武肺疫苗的現況、簡介疫苗的理念,引據各方科學證據及歷史前例,對文章命題作一簡略探討。1157Please respect copyright.PENANAnzjYHlAzep
1157Please respect copyright.PENANAwkphyYyTx7
(圖1)圖中為中國Phase疫苗3臨床研究的地域分佈概覽。依據官方說法,疫苗研發之時乃為中國武肺感染人數貧乏之時,為了探討疫苗效用,中國唯有選址國外將第三期臨床實驗,其人數及地域已詳列在圖中。1157Please respect copyright.PENANAfQjY0Me0ez
1157Please respect copyright.PENANAz9a6G6o4qi
1157Please respect copyright.PENANA6AckraLyNl
中國現時進入Phase3臨床研究的疫苗公司共有3間,分別為國營CNBG、科興 Sinovac及康希諾Cansino。1157Please respect copyright.PENANADAczWZxjWt
1157Please respect copyright.PENANAmt7GGMuUXw
其中國營CNBG及科興 Sinovac生產的疫苗均為滅活病毒疫苗,而香港政府則已決定選購科興 Sinovac生產的滅活病毒疫苗,唯政府專家小組已公開向傳媒表明沒有提議政府選購中國疫苗。1157Please respect copyright.PENANAH0QNjnrOTd
1157Please respect copyright.PENANAkHMQ61PsPp
除香港外,巴西政府在9月時份用上9千萬美金向科興 Sinovac購置4千6百萬枝滅活病毒疫苗,唯香港政府現時並沒有向外公開購置金額。1157Please respect copyright.PENANAsnUDJEYB5d
1157Please respect copyright.PENANAfUXEo65IrO
1157Please respect copyright.PENANAsiXuZoGrve
(圖2)注射武肺疫苗的主要目的,就是誘導身體產生對抗武肺病毒的抗體。1157Please respect copyright.PENANAsB1adqWudt
1157Please respect copyright.PENANAWPrTRpWe77
1157Please respect copyright.PENANAS5syW5OkYZ
疫苗主要功用有三,學界現時的研究相對上側重在第一點。1157Please respect copyright.PENANAcrXzjRb7jW
1157Please respect copyright.PENANAk8WfdhaM5G
一:抗體能夠阻礙病毒進入人體細胞。1157Please respect copyright.PENANA3BVVchkl4u
1157Please respect copyright.PENANAWj3TDjfpMd
二:抗體能夠標記病毒,1157Please respect copyright.PENANAeqqe7VFS0y
指示其他免疫細胞前來消滅病毒。1157Please respect copyright.PENANA3dz95Zw6jx
1157Please respect copyright.PENANAnKsRjLWKJT
三:某情況下,抗體更能夠指示免疫細胞殺滅已受病毒感染的細胞。1157Please respect copyright.PENANA9gF6XoCi0s
1157Please respect copyright.PENANADFguei5uI8
(圖3)用二分法來界定抗體種類的話,能夠阻礙病毒進入細胞的抗體,學界稱之為Neutralization Antibody。1157Please respect copyright.PENANA3r0WIpYdBo
1157Please respect copyright.PENANAKs0QOvjJ5S
1157Please respect copyright.PENANAyiptLZ5NVz
1157Please respect copyright.PENANAbLsDJB87Li
不能夠阻礙病毒進入細胞的抗體,學界則稱之為Non-Neutralization Antibody。1157Please respect copyright.PENANAp4cYAMtbsW
1157Please respect copyright.PENANA2ZghSnrVGO
換句話說,抗體並不是越多就越好,要有足夠多數量的Neutralization Antibody才能達到防疫功效。1157Please respect copyright.PENANAgdUzaS4l3T
1157Please respect copyright.PENANAPlLli7mMJR
(圖4)用上滅活病毒製作疫苗的話,人體產生的抗體會拼合在病毒不同位置之上。1157Please respect copyright.PENANAPWbwZj34qQ
1157Please respect copyright.PENANALso9CwFgnl
1157Please respect copyright.PENANAsaQL1TGOeu
若抗體並非拼合在S protein裡頭的關鍵位置上,產生的抗體有較大成數無法阻礙病毒進入細胞,亦即為Non-Neutralization Antibody。1157Please respect copyright.PENANA1yO2IRZNaf
1157Please respect copyright.PENANAInKh5NeGvE
相反,其他主流疫苗用上不同方式在人體內表達武肺S protein,人體產生的抗體主力針對S protein,較大成數為Neutralization Antibody。1157Please respect copyright.PENANAmaVsZYel6Y
1157Please respect copyright.PENANA6RBd1s1HEg
(圖5)滅活病毒疫苗有較大成數會產生Non-Neutralization Antibody,那又如何呢?1157Please respect copyright.PENANAn0hW2uzJDx
1157Please respect copyright.PENANAVusA6yeDUk
1157Please respect copyright.PENANAKJWYzmQTu0
在1960年,美國利用滅活病毒製作人類呼吸道合胞病毒 (Respiratory syncytial virus)疫苗。1157Please respect copyright.PENANA6vKUtM8oLG
80%的兒童注射後出現嚴重呼吸症狀,2名兒童死亡。1157Please respect copyright.PENANApydT8NoJxB
1157Please respect copyright.PENANAI7UAorpvjL
事後發現,滅活病毒所製作的疫苗所產生的Non-Neutralization Antibody數量對比Neutralization Antibody為多,因此出現名為ADE的症狀,引致注射疫苗的兒童比沒有注射的兒童更容易遭受病毒侵襲以及出現嚴症。1157Please respect copyright.PENANAZ0lman93XI
1157Please respect copyright.PENANAqt3fs5HLe6
1157Please respect copyright.PENANAg5YRawPMHJ
2016年,WHO世衛批准菲律賓為9歲以下的兒童注射以登革熱滅活病毒製作的Dengvaxia疫苗 ,認可其安全性。1157Please respect copyright.PENANATvf9wXTYdc
1157Please respect copyright.PENANAg93H9qKU1p
奈何,2017年疫苗公司發現疫苗會產生名為ADE的症狀,亦即會導致注射疫苗的人士更容易染上登革熱或出現嚴症,下令立即停止注射。1157Please respect copyright.PENANALdd5nAeSyF
1157Please respect copyright.PENANAUlbEikc3BZ
那時候已有超過830,000兒童注射疫苗,震驚四方。1157Please respect copyright.PENANAAL5sPiwCKb
2018年9月,「官方」數字為130兒童因注射疫苗而死亡,其中19人體內發現登革熱病毒,引證ADE的存在。1157Please respect copyright.PENANAeQnoa58ria
1157Please respect copyright.PENANAt4r7gdJZnR
既然擁有1960年ADE的先例,何解50年後菲律賓會再度出現ADE慘劇呢?1157Please respect copyright.PENANAhlUzPuAVki
1157Please respect copyright.PENANAMNrHFrgO80
其中之一的原因是,ADE無法在動物模型確實呈現,因此非常困難能夠預先作出探討。1157Please respect copyright.PENANAzmozoBgwvt
1157Please respect copyright.PENANAoHXkD8VyQ0
現時學界共識是,Neutralization Antibody :Non-Neutralization Antibody比例越高的話,1157Please respect copyright.PENANA5Cz2KFl0t7
ADE產生的機率便越低。1157Please respect copyright.PENANAp2RQskP0N9
但非常遺憾的是,亦有個別例子Neutralization Antibody 會引發ADE症狀。1157Please respect copyright.PENANArq2iJA8Qak
1157Please respect copyright.PENANAVGAyEFgjna
會否出現ADE症狀,只有依靠觀察人體臨床研究的結果才能得知,1157Please respect copyright.PENANAhTQw93Javk
這亦是為何第一間踏入臨床第三期研究的Moderna其正式完整報告官方日期為2022年7月,到那時候才會有相對確實資料疫苗會否引起ADE症狀。1157Please respect copyright.PENANAuKrotFnS2D
1157Please respect copyright.PENANARK9wYIjyOb
現時Moderna/輝瑞Pfizer/牛津AstraZeneca的中期第三期報告,無一能夠對ADE的安全性作出探討。1157Please respect copyright.PENANAQZ1AYn0dvS
1157Please respect copyright.PENANA8NNuxvJZwL
根據現時資料,最壞的ADE情況,將會是注射疫苗後的7-14日產生嚴重過敏免疫反應,肺部無法正常運作窒息而死。1157Please respect copyright.PENANANcC2Hse3Gl
較好的ADE情況,將為注射疫苗後更大機會染上武漢肺炎。1157Please respect copyright.PENANAOGpQkkmt7w
1157Please respect copyright.PENANA3h3VP94ZG3
在此,讓我們祝褔林鄭及三萬警察在注射疫苗後會出現ADE症狀,亦懇求麵神祝褔林鄭注射疫苗後不會出現ADE症狀。1157Please respect copyright.PENANApPUd5zQCRY
1157Please respect copyright.PENANA7MvRuaKJAH
ADE症狀延伸閱讀:https://lihkg.com/thread/2161912/page/11157Please respect copyright.PENANAoHoq45WukN
1157Please respect copyright.PENANAl83WjLaZqZ
如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。1157Please respect copyright.PENANAZ1OOb6Kv9S
1157Please respect copyright.PENANApGlnObQu7d
Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc1157Please respect copyright.PENANAMhAIB7GSf7
1157Please respect copyright.PENANAChwvzHG3Qj
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。1157Please respect copyright.PENANAw53rzNDxP8
1157Please respect copyright.PENANAhABq4mXgst
Link:1157Please respect copyright.PENANAAERywZpkqi
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1157Please respect copyright.PENANAVkM8Cssx0b
1157Please respect copyright.PENANAcJp9UMJVqv
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。1157Please respect copyright.PENANA35FhlJmPvb
1157Please respect copyright.PENANAv65Ykk0JgY
https://www.instagram.com/potatopigtongue/1157Please respect copyright.PENANA1RsdwIOG9f
1157Please respect copyright.PENANAcDWCyDl7rB
1157Please respect copyright.PENANAkYNaFioVB5
Ref1:https://science.sciencemag.org/content/370/6522/12631157Please respect copyright.PENANAw5ZtXpm1Rb
Ref2:https://www.nature.com/articles/nm0109-%20%20211157Please respect copyright.PENANAS5UFmHwsqL
Ref3:https://jvi.asm.org/content/jvi/94/17/e01083-20.full.pdf1157Please respect copyright.PENANAbmQUtoqWKc
Ref4:https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30843-4/fulltext1157Please respect copyright.PENANADWx6aujnnB
Ref5:https://www.sciencemag.org/news/2019/04/dengue-vaccine-fiasco-leads-criminal-charges-researcher-philippines1157Please respect copyright.PENANAAwVYDOvw2k