Following on from the first dose Pfizer data below where 7/15 participants above the age of 80 did not achieve neutralisation of virus, we report that all 15 have achieved neutralisation 3 weeks after second dose. https://twitter.com/GuptaR_lab/status/1350131626240598019

It could be that >80 yo are slower in mounting responses but this is unlikely and also leaves people vulnerable despite vaccine. Remember >80 y o are not featuring in trials so they might still get severe disease. Pre print to come but significant delays.

We should add that the second dose was given at 3 weeks after the first. Likely we should stick to this schedule in those above 80 years. Huge effort from @damicollier @rpdatir @CambridgeBRC