Researchers in Britain have warned of a “rapid drop” in antibody levels in those recovering from Covid-19.
Antibodies play an essential role in our immune systems, and they prevent viruses from entering our cells.
And researchers affiliated with “Imperial College London” found that the number of people, who have tested positive for antibodies, decreased by 26 percent between June and September.
The research team said that immunity wears off, it seems, which means the possibility of infection with the virus several times.
More than 350,000 people in England tested the antibodies as part of the study.
In the first stage, it was found that 60 people in every thousand had antibodies. But at the last stage of the tests, the antibodies appeared in only 44 people out of every 1,000.
This means that the number of people with antibodies decreased by more than 25 percent between summer and fall.
“Immunity fades very quickly,” said one of the researchers, Professor Helen Ward. “It’s only been three months since the first round of tests, and now we’re seeing a 26 percent drop in antibodies.”
And shows a lower level of antibodies significantly in those over the age of 65 years, compared with groups of young people that were tested. It also appears to decrease in those without symptoms than in those with severe symptoms.
The researchers indicated that the number of antibodies was high among health sector workers due to their permanent exposure to the virus.
Antibodies usually stick to the surface of the Coronavirus, preventing it from reaching our cells and stimulating the activity of the immune system.
Professor Wendy Barclay said, “It appears that immunity diminishes at the same level as the decrease in the number of antibodies, and this is evidence of a decline in immunity.”
There are rare cases of people who have been infected twice with the Covid-19 virus. However, the researchers warn that this may be due to immunity that is fading.
There is hope that the second wave of the virus outbreak will be less deadly than the first, even if the level of immunity decreases, because the body should have an “immune memory” from the first infection and be aware of how to face the disease.
The researchers said that the results they obtained do not affect hopes about the benefits of getting a vaccine, which may be more effective than the real infection. One of them emphasized that the need for a vaccine is still very great, and the data do not change this reality.