Having two doses of Covid vaccine remains the best way to protect against the Delta variant, first identified in India and now dominant in the UK.
The Oxford-AstraZeneca jab, though initially less effective, offers the same high protection as the Pfizer-BioNTech after four to five months, the largest study of its kind suggests.
But neither is as effective as it is against the Alpha variant, responsible for most UK infections last winter. There is insufficient data for Moderna. But researchers believe it "almost certainly at least as good as the others".
They analysed two and a half million tests results from 743,526 participants in the UK’s Covid-19 household-infection survey – led by Oxford University and the Office for National Statistics.
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