This is likely to mean immunity levels decline and raises the risk of reinfection, researchers say.
Levels of protective antibodies in people wane "quite rapidly" after coronavirus infection, say researchers.
In the first round of testing, at the end of June and the beginning of July, about 60 in 1,000 people had detectable antibodies.It suggests the number of people with antibodies fell by more than a quarter between summer and autumn. The number of healthcare workers with antibodies remained relatively high, which the researchers suggest may be due to regular exposure to the virus.Y-shaped antibodies stick to the surface of viruses to stop them infecting the body's cells
"On the balance of evidence, I would say it would look as if immunity declines away at the same rate as antibodies decline away, and that this is an indication of waning immunity."
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