1) 1077-person trial by Oxford ChAdOx1 show immune response in 14 days. Booster improves at 28 days.
2) 602-person trial in Wuhan: immune response within 14 days. No serious side effects.
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And Importantly, T-cell responses were induced in all participants.
This is why Andrew Pollard is hopeful for long term immunity cuz it improves both these immunity types.