Quote Originally Posted by Old git View Post
The simplest illustration can be seen from the sero prevalence data from the 19th April '21, when 69.3% of people had Covid antibodies, yet at the same time the greatest number that could have had them from vaccination was 31%.
On 19 April, about 68% of adults had covid antibodies, similar to your figure, so I agree on that (source ONS)

However, on 19 April, 62.5% of adults had one dose of the vaccine, or if we allow 14 days to acquire the antibodies, then on the 5th of April, 59.8% had at least one dose of the vaccine (source gov.co.uk). Far higher than 31%.