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Antibody levels against the coronavirus drop “quite quickly” after infection, British experts have found, according to the MTI.
Researchers at Imperial College London say the number of people who produced a positive antibody test fell by 26 percent in Britain between June and September, writes the BBC news portal.
Experts say that immunity appears to be weakened and there is a risk of reinfection with the virus.
In England, over 350,000 people have so far been tested for antibodies as part of the REACT-2 study.
In the first test, which took place between the end of June and the beginning of July, antibodies were detected in about 60 out of every 1,000 people. However, in the second round in September, only 44 of 1,000 remain.
“Immunity weakens pretty quickly, we’re only three months after the first test and we’ve already seen a 26 percent drop in antibodies,” he said. Helen Ward Professor, one of the authors of the study.
In general, there was a greater reduction in those asymptomatic by Covid-19, and in the different age groups, those older than 65 years had the greatest reduction in antibodies.
The number of confirmed reinfections is extremely low. The researchers say this may be because immunity has only started to wane from the March to April peak.
Experts say that the second infection can be milder than the first, even if immunity is lowered, because the body needs to have an immune memory of the first encounter with the virus and know how to protect itself against it.
Wendy barclay According to the professor, the rapid depletion of antibodies does not necessarily call into question the efficacy of the candidate vaccines currently in clinical trials. “A good vaccine can be much more effective than innate immunity,” the expert noted.
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