美國曲速行動計劃負(fù)責(zé)人表示,阿斯利康公司生產(chǎn)的新冠病毒疫苗對年輕注射者更有效,且小劑量要比大劑量效果更佳。
據(jù)合伙人透露,阿斯利康與牛津大學(xué)合作開發(fā)的疫苗,在注射全劑量的加強劑之前先注射一半劑量的疫苗,有效率達(dá)到了90%。不過,曲速行動計劃的蒙塞夫·斯拉維在11月24日的電話采訪中表示,這一做法只適用于年齡不超過55歲的注射者。
阿斯利康的報告發(fā)布之后,困惑就一直圍繞著研究人員:到底為什么小劑量的疫苗比大劑量還要有效?參與試驗的大多數(shù)人接受的是安慰劑或兩劑全劑量的治療方案,而有效率僅為62%。而斯拉維表示,這組受試者中含有年齡超過55歲的人。
美國投行SVB Leerink分析師杰弗里·伯吉斯說:“我認(rèn)為美國食品藥品監(jiān)督管理局(FDA)不會看好在進(jìn)行到一半改變劑量、年齡組或任何其他變量的任何試驗,無論是有意的還是無意的。”11月23日,他曾預(yù)測,美國食藥監(jiān)局將不會批準(zhǔn)該疫苗。
阿斯利康重申,具體數(shù)據(jù)將適時發(fā)表在同行評議期刊上。截至紐約時間下午4點,其美國證券存托憑證下跌達(dá)2.2%。
阿斯利康于11月23日公布試驗結(jié)果時,并未指出兩組試驗組不同的年齡劃分。斯拉維表示,一些人最初只使用了一半劑量,是因為部分藥瓶中的疫苗數(shù)量出現(xiàn)了錯誤。
他指出,還需要“了解許多變量”的數(shù)據(jù)情況,以及每種藥物在達(dá)到不同功效方面的各自的作用。
相較于年輕人,老年人對某些疫苗的反應(yīng)要弱,流感疫苗就是如此。但在上周,阿斯利康與牛津大學(xué)疫苗合作團(tuán)隊在醫(yī)學(xué)雜志《柳葉刀》上公布的二期試驗結(jié)果確稱,老年人對其疫苗顯示出強反應(yīng)。(財富中文網(wǎng))
編譯:楊二一
美國曲速行動計劃負(fù)責(zé)人表示,阿斯利康公司生產(chǎn)的新冠病毒疫苗對年輕注射者更有效,且小劑量要比大劑量效果更佳。
據(jù)合伙人透露,阿斯利康與牛津大學(xué)合作開發(fā)的疫苗,在注射全劑量的加強劑之前先注射一半劑量的疫苗,有效率達(dá)到了90%。不過,曲速行動計劃的蒙塞夫·斯拉維在11月24日的電話采訪中表示,這一做法只適用于年齡不超過55歲的注射者。
阿斯利康的報告發(fā)布之后,困惑就一直圍繞著研究人員:到底為什么小劑量的疫苗比大劑量還要有效?參與試驗的大多數(shù)人接受的是安慰劑或兩劑全劑量的治療方案,而有效率僅為62%。而斯拉維表示,這組受試者中含有年齡超過55歲的人。
美國投行SVB Leerink分析師杰弗里·伯吉斯說:“我認(rèn)為美國食品藥品監(jiān)督管理局(FDA)不會看好在進(jìn)行到一半改變劑量、年齡組或任何其他變量的任何試驗,無論是有意的還是無意的。”11月23日,他曾預(yù)測,美國食藥監(jiān)局將不會批準(zhǔn)該疫苗。
阿斯利康重申,具體數(shù)據(jù)將適時發(fā)表在同行評議期刊上。截至紐約時間下午4點,其美國證券存托憑證下跌達(dá)2.2%。
阿斯利康于11月23日公布試驗結(jié)果時,并未指出兩組試驗組不同的年齡劃分。斯拉維表示,一些人最初只使用了一半劑量,是因為部分藥瓶中的疫苗數(shù)量出現(xiàn)了錯誤。
他指出,還需要“了解許多變量”的數(shù)據(jù)情況,以及每種藥物在達(dá)到不同功效方面的各自的作用。
相較于年輕人,老年人對某些疫苗的反應(yīng)要弱,流感疫苗就是如此。但在上周,阿斯利康與牛津大學(xué)疫苗合作團(tuán)隊在醫(yī)學(xué)雜志《柳葉刀》上公布的二期試驗結(jié)果確稱,老年人對其疫苗顯示出強反應(yīng)。(財富中文網(wǎng))
編譯:楊二一
The dose of AstraZeneca Plc’s Covid vaccine that showed the highest level of effectiveness was tested in a younger population than a bigger dose that showed less efficacy, according to the head of the U.S. Operation Warp Speed program.
The vaccine being developed with Oxford University was 90% effective when a half-dose was given before a full-dose booster, the partners said on Monday. However, that regime was administered to participants in a group whose age was capped at 55, Warp Speed’s Moncef Slaoui said Tuesday in a phone call with reporters.
Researchers have been puzzling about the AstraZeneca report since it was released, wondering why a smaller dose of the vaccine might have appeared to be more effective than a larger one. Most of the people in the trial received a placebo or the regimen of two full doses, which was 62% effective. That group included people who were older than 55, Slaoui said.
“I don’t believe that the FDA will look positively at any trial where the dose, or the age cohorts, or any other variable were changed mid-trial, inadvertently or deliberately,” said Geoffrey Porges, an SVB Leerink analyst who predicted Monday that the U.S. Food and Drug administration would not clear the vaccine.
AstraZeneca reiterated that the data will be published in a peer-reviewed journal in due course. The drugmaker’s American depositary receipts fell as much as 2.2% as of 4 p.m. in New York.
There was no age breakdown given for the two groups from AstraZeneca when the company reported its results on Monday. The initial half-dose was used in some people because of an error in the quantity of vaccine put into some vials, Slaoui said.
“There are a number of variables that we need to understand, and what has been the role of each one of them in achieving the difference in efficacy,” Slaoui said.
Older people have a weaker response than younger people to some vaccines, like flu shots. Results from a phase 2 study of the Astra-Oxford vaccine published last week in The Lancet medical journal confirmed a strong response to the vaccine in older people.