The existing COVID-19 vaccine Delta variantA new strain of coronavirus that is contributing to the global proliferation of infections even in countries with high vaccination rates? There seems to be no clear answer yet, as actual research in different countries produces very different results.
NS British studies Published on Thursday New England Journal of MedicineUsing data from the UK Public Health Service, they found that the Pfizer / BioNTech vaccine was only 36% effective against delta mutants after the first dose. A single dose of the Oxford / AstraZeneca vaccine was only 30 percent effective. There were no data on the Moderna vaccine in this study.
Another real-world study conducted in Israel, one of the first countries to make the vaccine available, found similar results with the Pfizer / BioNTech vaccine.According to Thursday, data collected from a group of people between June 20th and July 17th showed that the vaccine was only 39 percent effective in preventing infections caused by delta mutants. Was report From the Ministry of Health of Israel.
In contrast, New research A single dose of one of three popular vaccines on the market (Pfizer / BioNTech, Modana, Oxford / AstraZeneca) gives Canadian companies “significant protection” against delta variants. I found that.
Specifically, a single dose of the Pfizer / BioNTech vaccine was 56% effective against symptomatic infections. Modena was 72% effective and Oxford / AstraZeneca was 67% effective. This study was published by AstraZeneca on Friday, but has not yet been peer reviewed.
Although there are significant differences in the efficacy of single doses, all three studies suggest that double doses of existing vaccines provide strong protection against hospitalization and death.
Both UK and Israeli studies have found that the Pfizer / BioNTech vaccine is more than 90% effective against serious illnesses caused by delta mutants after two doses.
A Canadian study focused on single-dose protection found that one shot of the Pfizer / BioNTech vaccine was 78% protected against severe illness and death. The same doses of Moderna and Oxford / AstraZeneca were 96% and 88% effective, respectively.
More realistic data are needed to assess the effectiveness of existing vaccines against new variants. In Israel, for example, the fact that “recently biased exposure patterns are confined to specific population sectors and regions” means that the analysis may not be able to take into account all factors. Means Expert advisory team on Thursday’s COVID-19 response.
We are trying to complement this research approach with additional approaches, taking into account additional personal characteristics. However, this will take time and increase the number of cases, “Bariser told reporters. Bloomberg..
Efficacy of COVID-19 vaccine against delta variants: Pfizer, Moderna, Oxford
Source link Efficacy of COVID-19 vaccine against delta variants: Pfizer, Moderna, Oxford