Having two quantities of Covid vaccine remains the best way to protect against the Delta variant, first identified in India and now reigning in the UK.

The Oxford-AstraZeneca jab, though initially less effective, offers the same high-pitched care as the Pfizer-BioNTech after four to five months, the largest study of its category suggests.

But neither is as effective as it is against the Alpha variant, responsible for most UK illness last-place winter. There is insufficient data for Moderna. But investigates believe it “almost certainly at least as good as the others”.

They analysed two and a half million exams results from 743,526 participants in the UK’s Covid-1 9 household-infection survey – led by Oxford University and the Office for National Statistics.

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