The mRNA vaccines (Pfizer and Moderna) continue to do very well against the variants compared to the viral vector vaccines like AstraZeneca.
In the UK where the Delta Covid variant from India is spreading:
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How serious is Delta Covid variant for UK and do vaccines stop it?
According to PHE, the effectiveness of both the Oxford/AstraZeneca and BioNTech/Pfizer vaccines in preventing symptomatic disease after a single dose drops to 33 per cent because of the Delta variant.
But, after two doses, this figure rises steeply to 60 per cent for Oxford/AstraZeneca and 88 per cent for BioNTech/Pfizer.