In England, it is estimated that around 9 in 10 adults, or 91.9% of the adult population (95% credible interval: 90.5% to 93.0%) would have tested positive for antibodies against coronavirus (COVID-19) - SARS-CoV-2 - on a blood test in the week beginning 28 June 2021, suggesting they had the infection in the past or have been vaccinated.
In Wales, it is estimated that around 9 in 10 adults, or 92.6% of the adult population (95% credible interval: 91.0% to 94.0%) would have tested positive for antibodies against SARS-CoV-2 on a blood test in the week beginning 28 June 2021, suggesting they had the infection in the past or have been vaccinated.
In Northern Ireland, it is estimated that 9 in 10 adults, or 90.0% of the adult population (95% credible interval: 87.5% to 92.3%) would have tested positive for antibodies against SARS-CoV-2 on a blood test in the week beginning 28 June 2021, suggesting they had the infection in the past or have been vaccinated.
In Scotland, it is estimated that nearly 9 in 10 adults, or 88.6% of the adult population (95% credible interval: 86.7% to 90.3%) would have tested positive for antibodies against SARS-CoV-2 on a blood test in the week beginning 28 June 2021, suggesting they had the infection in the past or have been vaccinated.
Across all four countries of the UK, there is a clear pattern between vaccination and testing positive for COVID-19 antibodies but the detection of antibodies alone is not a precise measure of the immunity protection given by vaccination.