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Covid Vaccines Are Less Effective Against Delta, Large Study Finds
Posted
August 19, 2021
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August 19, 2021
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0:41Now PlayingCovid-19 vaccines are less effective against the delta variant, according to results in the U.K. from one of the largest real-world studies into the efficacy of the shots.
Pfizer Inc. and BioNTech SE’s messenger RNA vaccine lost effectiveness in the first 90 days after full vaccination, though that shot and the one made by AstraZeneca Plc still staved off a majority of Covid infections. When vaccinated people did get infected with delta, they were shown to have similar levels of virus in their bodies as those who hadn’t had shots. This suggests that vaccinating large portions of a population might not protect those who don’t get inoculated, casting doubt on the idea of achieving herd immunity.
There isn’t yet data to show how much the vaccines continue to protect against hospitalizations and severe cases of Covid over time.
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