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Variants of Covid: How Much Protection Do Different Vaccines Offer? | Coronavirus

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Variants of Covid: How Much Protection Do Different Vaccines Offer?  |  Coronavirus

On Wednesday, Boris Johnson said he saw nothing in the current data to stop the planned lifting of Covid restrictions in England on June 21. But he said questions remained about how much protection current vaccines offer against the Delta variant, B.1.617.2.

What What does the efficacy of the vaccine mean?

Vaccine effectiveness is given as a percentage and refers to how well a vaccine works in the real world, as opposed to the term efficacy, which relates to the performance of vaccines in trials. Figures are often given for symptomatic disease, although other outcomes, such as infection, hospitalization, or death, can be used.