This compared to 6% who were found to have antibodies between June 20 and July 13, and 4.8% between July 31 and August 31.
The number of people having antibodies decreased by 26.5% over three months, according to research by the Department of Health and Social Care.
The study included more than 365,000 randomly selected adults in England who used finger-prick antibody tests at home.
And between June 20 and September 28, the percentage of people who tested positive for antibodies decreased from 6% to 4.4%.
And the Department of Health and Social Care said this indicates a decrease in antibodies in the weeks or months after a person is infected.
The Minister of Health, Lord Bethel, said that the study showed that people are not immune to the Corona virus just because they have proven the presence of antibodies.
He added, “This study led by” Imperial “and Ipsos MORI is an important part of the research, helping us understand the nature of the antibodies to” Covid-19 “over time, and improve our understanding of the virus itself. We rely on this type of important research to inform our ongoing response to the disease. “It is also important that everyone knows what this means for them – this study will help in our fight against the virus, but a positive antibody test does not mean that you are immune to“ Covid-19 ”, so that we can continue to take the right action at the right time.
It also appears that antibody responses vary over time depending on the person’s age and symptoms.
The study suggested that people who did not show symptoms of “Covid-19” are likely to lose detectable antibodies sooner than those who showed signs of the disease.
The results also show that the loss of antibodies was slower in people between the ages of 18 and 24, compared to those aged 75 and over.
Professor Paul Elliott, Director of the REACT Program, said: “Our study shows that over time, there is a decrease in the proportion of people who test positive for antibodies to the virus that causes“ Covid-19. ”It is still not clear what level of immune antibodies it provides, or “How long does this immunity last. If someone tests positive for antibodies, they still need to follow national guidelines including social distancing measures, take a swab test if symptoms appear, and wear face coverings when necessary.”
Helen Ward, one of the lead authors of the antibody report, said: “This very large study has shown that the proportion of people who have antibodies can decrease over time. We don’t know yet if this would leave these people at risk of reinfection with the virus, but It is imperative that everyone continues to follow the guidelines to reduce risks to themselves and others. ”
The results of the study indicate that the first wave of the epidemic occurred in a short period, in March and April.
It appears that there has been a sharp drop in the proportion of people who reported symptoms of “Covid-19” and who tested positive for antibodies from early April.
While positive antibody tests have decreased in the general population, the number of health workers who test positive for them has not changed.
The researchers believe this may be due to an increased initial or repeated exposure.
And there was a decrease in positive antibody tests in people of all age groups, although the smallest was among people between the ages of 18 and 24.
This group saw a decrease of 14.9%, compared to the group that includes people over 75 years of age, which saw a decrease in the number of people who have antibodies by 39%.
Asymptomatic cases saw a 64% decrease in antibodies, compared to a 22.3% decrease among people who tested positive for the virus.
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