Covid Vaccines Less Effective Against Delta Variant—And Pfizer’s Effectiveness Wanes Rapidly—Large Study Finds

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Covid Vaccines Less Effective Against Delta Variant—And Pfizer’s Effectiveness Wanes Rapidly—Large Study Finds
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I am a London-based reporter for Forbes covering breaking news. Previously, I have worked as a reporter for a specialist legal publication covering big data and as a freelance journalist and policy analyst covering science, tech and health. I have a master’s degree in Biological Natural Sciences and a master’s degree in the History and Philosophy of Science from the University of Cambridge. Follow me on Twitter @theroberthart or email me at [email protected]

from scientists at the University of Oxford found the shots to be less protective against infection and to lose effectiveness rapidly in the months following vaccination, adding weight to calls to administer booster shots even as many countries have barely begun their vaccination campaigns. gettyThe team compared the effectiveness of shots made by AstraZeneca, Pfizer and Moderna against alpha and delta variants, the two most recent dominant strains in the U.S. and U.K.

While the vaccines showed strong protection against Covid-19, the study, which has not yet been published or peer reviewed, found they were less effective against the delta variant. The Moderna vaccine appeared to be the most effective against delta after one shot, the researchers wrote, though the group said the young average age of recipients could be responsible for this finding and that a full assessment of two Moderna shots was not possible in the study.

The researchers found that while the Pfizer shot was initially much more protective than the AstraZeneca vaccine, this waned rapidly after vaccination and in four or five months matched the more stable level of protection offered by AstraZeneca. Despite diminished protection, the researchers said that getting fully vaccinated against Covid-19 remains the best way to protect against the delta variant and that the “effectiveness of two doses remains at least as great as protection afforded by prior natural infection.”Fully vaccinated people infected with the delta Covid-19 variant still carry the same amount of coronavirus as unvaccinated people, the study found.

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