As lockdown easing in England is delayed from 21 June to a possible date of 19 July amid concerns of a substantial wave of hospitalisations due to the Delta variant of coronavirus, we take a look at the latest data on the protection offered by vaccines.
What does vaccine effectiveness mean?
Vaccine effectiveness refers to how well a vaccine works in the real world. The figures are given with respect to particular outcomes, such as infection, symptomatic disease, hospital admission or death.
If a Covid-19 vaccine is “90% effective” against symptomatic disease it means vaccinated people have a 90% lower risk of developing the illness than those who have not been
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