美國疾病控制與預(yù)防中心(Centers for Disease Control and Prevention)的報(bào)告顯示,隨著德爾塔變種病毒成為主要病毒株,一線工作者接種新冠疫苗的有效性從之前的91%下降至66%。
該中心稱,新冠疫苗依舊有保護(hù)作用,而且對于研究結(jié)果必須慎重解釋,因?yàn)橐呙缬行钥赡軙S著時(shí)間推移減弱,而且對疫苗效能的估計(jì)并不準(zhǔn)確。
研究人員在美國疾病控制與預(yù)防中心的《發(fā)病率和死亡率周報(bào)》(Morbidity and Mortality Weekly Report)中寫道:“雖然中期研究結(jié)果顯示,新冠疫苗預(yù)防感染的有效性有適度下降,但依舊能夠?qū)⒏腥撅L(fēng)險(xiǎn)降低三分之二,這凸顯出新冠疫苗的重要性和價(jià)值?!?/p>
這份研究結(jié)果與以色列和英國之前的證據(jù)相呼應(yīng)。兩國的研究表明,隨著德爾塔變種病毒傳播,新冠疫苗在預(yù)防感染方面的效果逐步下降。這些結(jié)論刺激拜登政府制定了向美國大部分疫苗接種者施打加強(qiáng)針的計(jì)劃,但該計(jì)劃仍然在等待監(jiān)管部門批準(zhǔn)。拜登政府計(jì)劃從9月20日開始施打加強(qiáng)針。
這項(xiàng)觀察研究從2020年12月至2021年8月,跟蹤了美國6個(gè)州8個(gè)地點(diǎn)的4000多名醫(yī)護(hù)人員、急救人員和其他一線工作人員。這些人員每周接受一次新冠病毒檢測,其中約83%接種了疫苗。
接種新冠疫苗的人員約有三分之二接種的是輝瑞(Pfizer Inc.)-BioNTech疫苗,2%接種的強(qiáng)生(Johnson & Johnson)疫苗,其他人員接種的是Moderna Inc.的疫苗。
總體而言,在研究期間,接種疫苗預(yù)防感染的有效性預(yù)計(jì)為80%。
隨著德爾塔變種病毒成為主要病毒株,新冠疫苗的有效性逐步減弱,這一研究結(jié)果存在一個(gè)重要的問題:估算的范圍存在高度不確定性。研究人員報(bào)告稱,在研究期間,新冠疫苗的效能為26%至84%,置信區(qū)間為95%。(財(cái)富中文網(wǎng))
譯者:劉進(jìn)龍
審校:汪皓
美國疾病控制與預(yù)防中心(Centers for Disease Control and Prevention)的報(bào)告顯示,隨著德爾塔變種病毒成為主要病毒株,一線工作者接種新冠疫苗的有效性從之前的91%下降至66%。
該中心稱,新冠疫苗依舊有保護(hù)作用,而且對于研究結(jié)果必須慎重解釋,因?yàn)橐呙缬行钥赡軙S著時(shí)間推移減弱,而且對疫苗效能的估計(jì)并不準(zhǔn)確。
研究人員在美國疾病控制與預(yù)防中心的《發(fā)病率和死亡率周報(bào)》(Morbidity and Mortality Weekly Report)中寫道:“雖然中期研究結(jié)果顯示,新冠疫苗預(yù)防感染的有效性有適度下降,但依舊能夠?qū)⒏腥撅L(fēng)險(xiǎn)降低三分之二,這凸顯出新冠疫苗的重要性和價(jià)值。”
這份研究結(jié)果與以色列和英國之前的證據(jù)相呼應(yīng)。兩國的研究表明,隨著德爾塔變種病毒傳播,新冠疫苗在預(yù)防感染方面的效果逐步下降。這些結(jié)論刺激拜登政府制定了向美國大部分疫苗接種者施打加強(qiáng)針的計(jì)劃,但該計(jì)劃仍然在等待監(jiān)管部門批準(zhǔn)。拜登政府計(jì)劃從9月20日開始施打加強(qiáng)針。
這項(xiàng)觀察研究從2020年12月至2021年8月,跟蹤了美國6個(gè)州8個(gè)地點(diǎn)的4000多名醫(yī)護(hù)人員、急救人員和其他一線工作人員。這些人員每周接受一次新冠病毒檢測,其中約83%接種了疫苗。
接種新冠疫苗的人員約有三分之二接種的是輝瑞(Pfizer Inc.)-BioNTech疫苗,2%接種的強(qiáng)生(Johnson & Johnson)疫苗,其他人員接種的是Moderna Inc.的疫苗。
總體而言,在研究期間,接種疫苗預(yù)防感染的有效性預(yù)計(jì)為80%。
隨著德爾塔變種病毒成為主要病毒株,新冠疫苗的有效性逐步減弱,這一研究結(jié)果存在一個(gè)重要的問題:估算的范圍存在高度不確定性。研究人員報(bào)告稱,在研究期間,新冠疫苗的效能為26%至84%,置信區(qū)間為95%。(財(cái)富中文網(wǎng))
譯者:劉進(jìn)龍
審校:汪皓
The effectiveness of COVID-19 vaccines among frontline workers declined to 66% after the Delta variant became dominant, compared with 91% before it arose, according to a report from the Centers for Disease Control and Prevention.
The vaccines are still protective, the CDC said, and the finding must be interpreted with caution, as vaccine effectiveness might wane over time and the estimates of efficacy were imprecise.
“Although these interim findings suggest a moderate reduction in the effectiveness of COVID-19 vaccines in preventing infection, the sustained two-thirds reduction in infection risk underscores the continued importance and benefits of COVID-19 vaccination,” researchers wrote in the agency’s Morbidity and Mortality Weekly Report.
The findings echo earlier evidence from Israel and the U.K. suggesting COVID vaccines lost some potency in preventing infections over time as the Delta variant spread. Those conclusions helped spur the Biden administration’s plan to administer booster doses to most vaccine recipients in the U.S., which is still awaiting regulators’ sign-off. The booster campaign is set to begin Sept. 20.
The observational study tracked more than 4,000 health-care workers, first responders, and other frontline personnel in eight U.S. locations across six states from December 2020 to August 2021. They were tested weekly for COVID infection, and about 83% were vaccinated.
About two-thirds of those vaccinated had received the Pfizer Inc.-BioNTech SE shot, 2% received Johnson & Johnson’s, and the rest received the Moderna Inc. vaccine.
Overall, vaccinations were estimated to be 80% effective in preventing infection during the study period.
The finding of diminished effectiveness when Delta was the dominant virus strain comes with an important caveat: The range of that estimate is highly uncertain. Researchers reported 95% confidence that the efficacy was between 26% and 84% in that period.