The Pfizer and AstraZeneca coronavirus vaccines reduce the risk of death from the Delta variant by 90%, a new U.K. study finds.
The Delta variant is now the dominant form of the coronavirus in the United States, the United Kingdom and many other countries.
The study collected data from 5.4 million people in Scotland between April 1 and Sept. 27, 2021, is the first country-wide assessment of the effectiveness of vaccines in preventing death from the Delta variant.
The Pfizer vaccine was 90% effective and the AstraZeneca vaccine was 91% effective in people who were fully vaccinated but tested positive for the Delta variant, according to the findings published Oct. 20 as a letter in the New England Journal of Medicine.
AstraZeneca’s vaccine is not available in the United States.
Deaths from COVID-19 were defined as anyone who died within 28 days of a positive PCR test, or who had