LONDON, United Kingdom (AFP) \u2014 Asymptomatic coronavirus sufferers appear to lose detectable antibodies sooner than people who have exhibited COVID-19 symptoms, according to one of the biggest studies of its kind in Britain published on Tuesday.<\/p>\n
The findings by Imperial College London and market research firm Ipsos Mori also suggest the loss of antibodies was slower in 18\u201324 year-olds compared to those aged 75 and over.<\/p>\n
Overall, samples from hundreds of thousands of people across England between mid-June and late September showed the prevalence of virus antibodies fell by more than a quarter.<\/p>\n
The research, commissioned by the British government and published Tuesday by Imperial, indicates people’s immune response to COVID-19 reduces over time following infection.<\/p>\n
James Bethell, a junior health minister, called it “a critical piece of research, helping us to understand the nature of COVID-19 antibodies over time”.<\/p>\n
But scientists involved cautioned that a great deal remains unknown about people’s long-term antibody response to the virus.<\/p>\n
“It remains unclear what level of immunity antibodies provide, or for how long this immunity lasts,” said Paul Elliott, of Imperial’s School of Public Health.<\/p>\n
The study involved 365,000 randomly-selected adults administering at home three rounds of finger prick tests for coronavirus antibodies between June 20 and September 28.<\/p>\n
The results showed the number of people with antibodies fell by 26.5 per cent over the approximate three-month period.<\/p>\n
Scaled up to a nationwide level, it meant the proportion of the English population with antibodies dropped from 6.0 per cent to 4.4 per cent, according to the study.<\/p>\n
The decline coincided with the prevalence of the virus falling dramatically across England \u2014 and the rest of Britain \u2014 following a months-long national shutdown, which was eased over the summer.<\/p>\n
However, the research found the number of health care workers testing positive for antibodies did not change over time, potentially reflecting repeated, or higher initial, exposure to the virus.<\/p>\n
“This very large study has shown that the proportion of people with detectable antibodies is falling over time,” said Helen Ward, one of the lead authors.<\/p>\n
“We don’t yet know whether this will leave these people at risk of reinfection with the virus that causes COVID-19, but it is essential that everyone continues to follow guidance to reduce the risk to themselves and others.”<\/p>\n
LONDON, United Kingdom (AFP) \u2014 Asymptomatic coronavirus sufferers appear to lose detectable antibodies sooner than people who have exhibited COVID-19 symptoms, according to one of the biggest studies of its kind in Britain published on 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United Kingdom (AFP) \u2014 Asymptomatic coronavirus sufferers appear to lose detectable antibodies sooner than people who have exhibited COVID-19 symptoms, according to one of the biggest studies of its kind in Britain published on 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