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Covid Vaccine Targeting Delta Variant May Be Needed, U.K. Study Says
Posted
August 4, 2021
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0:49Now PlayingVaccines targeting the highly transmissible delta variant may now be needed, given its ability to infect people with fading immunity and potentially increased severity, researchers leading a large English study of Covid shots said.
A third wave of English cases has been driven by the delta strain among both unvaccinated people -- especially those aged 12 to 24 -- as well as some people who had received Covid shots, according to authors of a study of samples from about 98,000 people in England. The effectiveness of vaccines at stopping infection during the study period fell to 49%, the researchers estimated, down from 64% in a month earlier. Vaccines’ protection against development of Covid symptoms was 59%, down from 83%.
“Development of vaccines against delta may be warranted,” in the light of evidence that the strain’s spike protein has mutated to a point where antibodies raised by current shots are becoming less effective, the researchers said.
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