Delta 菌株降低了美国疫苗的有效性: 仅有的 66% 保持

快科技8月报道 29 美国疾病控制与预防中心近日发布的一项研究显示，COVID-19的δ突变株成为疫情“主力”后, 美国批准的 COVID-19 疫苗的整体有效性已降低. 约三分之一.

Researchers analyzed the vaccinations and infections of thousands of front-line anti-epidemic workers in the United States for multiple weeks since December 14, 2020. They have undergone nucleic acid testing every week. During the delta strain, 488 workers who were not vaccinated, 19 were infected, 其中 94.7% were symptomatically infected; 2352 were fully vaccinated workers, 其中 24 were infected, including symptomatic infections The proportion of participants is 75%.

Researchers analyzed that the overall effectiveness of Pfizer, Modena, and Johnson & Johnson vaccines in the United States was 66% in the face of the Delta strain, while the previously released effectiveness number was 91%. 然而, the CDC did not disclose the severity of the disease after infection, especially those who have been vaccinated and then infected.

Just a few days ago, my country’s Chongqing Zhifei Biological released the effectiveness data of its recombinant COVID-19 vaccine. The overall protection rate is 81.76%. The protection rate for severe and above cases and death cases is 100%. The protection rates of the strains were 92.93% 和 77.54%, 分别, and the safety was good.

来源: Fong Shun Financial Research Center