“Our antibody response to coronavirus could decline over time, according to a new study. A study by Imperial College London and Ipsos MORI tested more than 365,000 people in England between June and September to see if they had any COVID-19 antibodies. Antibodies are a type of protein produced by the body in response to an infection to fight the attack. Researchers found that the number of people who tested positive for coronavirus antibodies was 6% between June 20 and July 13. But by the end of September, this had dropped to just 4.4%. Experts said the results of the study could suggest that our antibody response to COVID-19 reduces over time. Helen Ward, one of the lead authors, said: “This very large study has shown that the proportion of people with detectable antibodies is falling over time. “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.” It remains unclear whether COVID-19 antibodies — which are produced when the body is attacked by an infection — provide any effective level of immunity. But the study found that the reduction in the prevalence of antibodies was not equal across all age groups. People aged 18 to 24 had the highest prevalence of antibodies between June and September – and this figure declined at the slowest rate out of all age groups. Meanwhile, people aged 75 and over not only had the lowest prevalence of antibodies, but also the biggest decline in numbers. In the latest round of the study, between Sept. 15 and 28, the prevalence of antibodies was highest in London, and in those of Black and Asian ethnicity. Scientists said the results of the research showed that a vaccine is needed to protect large numbers of the population, and so-called “herd immunity” is still a “long, long way” off. Graham Cooke, professor of infectious diseases at Imperial College London, said: “The big picture here is that after the first wave, the great majority of the country still did not have evidence of protective immunity.” It means the country still has a “great majority of people” who are unlikely to have been exposed to COVID-19, he said. “So the need for a vaccine is still very large if you want to try and get a large level of protection in the population.” A HuffPost Guide To Coronavirus Get the latest coronavirus updates here. What will life be like once a coronavirus vaccine arrives? Everything you need to know about face masks right now. What should you still be disinfecting to prevent COVID-19? Is it possible you had coronavirus earlier this year? Constantly arguing with your partner about coronavirus risks? You are not alone. Everyone deserves accurate information about COVID-19. Support journalism without a paywall — and keep it free for everyone — by becoming a HuffPost member today.
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