One dose of a Covid vaccine appears to be giving 67% protection against the virus after three weeks, a leading expert has declared.
Real-world data on people who've had the jab suggested there was "no protection at all" in the first two weeks, Prof Spector said.
But this protection rose to 46% after two weeks and 67% after three to six weeks, the King’s College London scientist said. Prof Spector revealed preliminary findings from the ZOE COVID Symptom Study app, which he leads, in a TV interview today.
It is understood the figure applies to the Pfizer vaccine, not the AstraZeneca vaccine. It refers to getting Covid at all, not just serious illness, the study team said.