Covid-19: How vaccines work against the Delta variant

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The Delta variant of the coronavirus, first identified in India, is a cause for global concern with studies showing it is more contagious and resistant to vaccines than other forms of Covid.

Here is what we know about how variants respond to jabs.Several lab tests show that the Delta variant seems to have stronger resistance to vaccines than other variants do.

A French study from the Pasteur Institute concluded that neutralising antibodies produced by vaccination with the Pfizer/BioNTech jab are three to six times less effective against the Delta variant than against the Alpha variant.Although they represent an essential marker, the levels of antibodies measured in a lab are not enough to determine the efficacy of a vaccine.

Previous data released by British health authorities at the end of May come to similar conclusions for less serious forms of the illness. For the others, lab and real-world tests both conclude that one dose of any vaccine only gives limited protection against the Delta variant. In the UK -- where the Delta variant is now responsible for 96 percent of new cases -- these findings pushed the government on Monday to reduce the waiting period between doses from 12 weeks to eight for people over 40.

 

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