Delta Strain Reduces The Effectiveness Of US Vaccines: Only 66% Remain

Kuai Technology reported on August 29 that a study recently released by the Centers for Disease Control and Prevention of the United States showed that after the delta mutant strain of the COVID-19 became the “main force” of the epidemic, the overall effectiveness of the COVID-19 vaccine approved in the United States has been reduced. About one-third.

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, of which 94.7% were symptomatically infected; 2352 were fully vaccinated workers, of which 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%. However, 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% and 77.54%, respectively, and the safety was good.

Source: Fong Shun Financial Research Center