But the jabs were more effective against the Alpha variant, the largest study of its kind suggests.
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.
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.The Pfizer-BioNTech vaccine had 93% effectiveness against symptomatic infection two weeks after the second dose, compared with Oxford-AstraZeneca's 71%.
But there was no cause for alarm, Prof Sarah Walker, at the University of Oxford, said because "when you start very very high, you've got a long way to go"."Both of these vaccines are still doing very well against Delta.
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