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Roughly half of people in the UK now have antibodies against Covid, either through infection or vaccination, tests conducted by the Office for National Statistics (ONS) show.
Most of this will be through vaccination – with 30 million people having received at least one dose.
Antibodies are proteins in the blood which recognise specific infections and fight them off.
Among the oldest who are most at risk, levels are even higher.
But there has been a small decline in detectable antibodies in that group since the peak of infections in January.
The ONS speculates