In their findings, the researchers' analysis of the home finger-prick tests found that the number of people testing positive for antibodies dropped by 26.5% during the study period, from nearly 6% to 4.4%.
According to a recent study carried out by researchers at the Imperial College London, the proportion of people in Britain with antibodies that protect against COVID-19 declined over the summer, adding to evidence that natural immunity can wane in a matter of months. Instead of people developing more antibodies during that period of time, which their immune systems would then use to fight COVID-19, the REACT (Real-time Assessment of Community Transmission) study found that antibodies fell by roughly 26% during the period in question.
Scientists have found the number of people with coronavirus antibodies had fallen by around a quarter between June and September.
There was a steeper decline in those over 65 and in those who were asymptomatic compared with those who had symptoms. Despite this, Chepurnov did not contract the virus again, even after repeated exposure to coronavirus patients.
Graham Cooke, professor of infectious diseases at Imperial College London, said: "The big picture here is that after the first wave (of coronavirus), the great majority of the country still did not have evidence of protective immunity". Given the death rate from COVID-19, some critics have described such strategies as "genocidal", in that they sacrifice lives that might be saved through quarantine and social measures like paying people to stay home.
Such results have delivered a blow to herd immunity - which, remember, is definitely not the government's real policy of dealing with the virus - due to fears over reinfection once recovery from coronavirus is complete.
Research is still underway to determine how long antibodies are present after infection and if that presence provides immunity.
"For some viruses, there's lifelong immunity".
Researchers in the United Kingdom say they've observed a "significant" decline in the percentage of the population with COVID-19 antibodies, potentially pointing to "waning immunity".
Imperial's study, based on a survey of 365,000 randomly selected adults, was released as a pre-print paper, and has not yet been peer-reviewed.
The study, conducted by Imperial College London and published Tuesday, involved tests on more than 365,000 British people between June 20 and September 28.