London — Antibodies against the novel coronavirus declined rapidly in the British population during the northern hemisphere summer, a study found on Tuesday, suggesting protection after infection may not be long lasting and raising the prospect of waning immunity in the community.
Although immunity to the novel coronavirus is a complex and murky area, and may be assisted by T-cells, as well as B-cells that can stimulate the quick production of antibodies following re-exposure to the virus, the researchers said the experience of other coronaviruses suggested immunity might not be enduring.
Those for whom Covid-19 was confirmed with a gold standard PCR test had a less pronounced decline in antibodies, compared to people who had been asymptomatic and unaware of their original infection. World Health Organisation spokesperson Tarik Jasarevic said that uncertainty over how long immunity would last and the fact most people had never had antibodies against the coronavirus in the first place showed the need to break transmission chains.
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