Two covid-19 vaccines are 15 per cent less effective against delta
A large UK study shows that two doses of the Pfizer or AstraZeneca vaccines provide good protection against symptomatic infections by the delta coronavirus variant, but not as good as against older variants
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A large UK study shows that two doses of the Pfizer or AstraZeneca vaccines provide good protection against symptomatic infections by the delta coronavirus variant, but not as good as against older variants
