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And this is how it appears to be working in the real world, not trial conditions:
https://www.timesofisrael.com/how-well-does-the-vaccine-work-israels-real-world-stats-can-be-globes-guide/
greentricky
The 52% often quoted includes the early period when it does nothing. The effectiveness after 15 days is estimated at 89%.
They also reckon the Oxford vaccine is 73% effective 22 days after one dose.