Children aged 8 to 15 years had the lowest antibody levels. At higher antibody thresholds, those aged 70 years and over generally had greater levels of antibodies compared with other age groups. This is likely the result of different infection rates, numbers of vaccinations received, and time since last vaccination across the different age groups. The 800 ng/ml level is the highest level at which we can produce a historical series back to November 2021.ĭownload this chart Antibody levels varied by age group Imageįrom 8 August to 4 September 2022, antibody levels in the UK were greatest in young adults aged 16 to 24 years and those aged 70 years and over. There is not sufficient evidence available yet to determine the appropriate level for the Omicron variant. ![]() Our 179 ng/ml level reflects the percentage of children likely to have a sufficiently strong antibody response to provide some protection from getting a new COVID-19 infection with the Delta variant. In the same week, an estimated 20.9% of children aged 8 to 11 years and 51.3% of children aged 12 to 15 years had antibodies against SARS-CoV-2 at or above the higher level of 800 ng/ml. The proportion of children estimated to have antibodies against SARS-CoV-2 at or above the 179 ng/ml level remained high for those aged 8 to 11 years (60.8%) and those aged 12 to 15 years (83.6%) in the week beginning 13 February 2023. These higher levels provide a more informative view of population antibody levels and give earlier indication of antibody levels waning. Levels at 2,000 ng/ml, 4,000 ng/ml and 6,000 ng/ml were introduced to identify higher concentrations of antibodies in the blood. Our 179 ng/ml level reflects the percentage of adults likely to have a sufficiently strong antibody response to provide some protection from getting a new COVID-19 infection with the Delta variant. These ranges are shown as a shaded area, with larger areas showing a greater proportion of people who have antibody levels within that range. Less than 179 ng/ml (including those with low or no antibodies against SARS-CoV-2)įrom 2,000 ng/ml to less than 4,000 ng/mlįrom 4,000 ng/ml to less than 6,000 ng/ml This chart shows the proportion of the adult population, by age and country, estimated to have antibodies against SARS-CoV-2 in the following ranges: The percentages shown in this chart include antibody levels up to, but below the upper threshold stated. ![]() Since January 2023, there has been a decrease in the proportion of those estimated to have antibodies to SARS-CoV-2 at or above 4,000 ng/ml, across most age groups. Read more about this in our Coronavirus (COVID-19) Infection Survey, antibody data: UK bulletinĪcross the UK, the highest antibody levels were seen amongst those aged 65 years and above. See our more information page to read about antibody levels. Please read our Antibodies and Immunity blog for more information. Testing negative means that an individual did not have enough antibodies to be detected in the test, not that they do not have any immune protection against the virus. This means estimates for 800 ng/ml or higher are not available for this period, and estimates at or above the 179 ng/ml level for February 2022 are subject to change. The 800 ng/ml level is the highest level at which we can produce a historical series back to December 2020 and enables enhanced monitoring of antibody waning.Īn issue with antibody lab results from 10 January to 27 February 2022 primarily impacted 800 ng/ml estimates. ![]() There is not sufficient evidence available yet to determine the appropriate level for this. ![]() This level is unlikely to provide equivalent protection against the Omicron variant. In the same week, an estimated 77.7% of adults in England, 79.5% in Wales, 74.5% in Northern Ireland and 79.8% in Scotland had antibodies against SARS-CoV-2 at or above the higher level of 800 ng/ml. In the UK, the proportion of adults with antibodies at or above the 179 ng/ml level remained high in the week beginning 13 February 2023. Embed this interactive Copy Download the data
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