Study reveals COVID-19 antibody levels fall rapidly after infection

29 Octobre, 2020, 17:32 | Auteur: Anatole Charbonneau

A study conducted in the United Kingdom found that during the summer, antibodies against the novel coronavirus rapidly declined in the British population, a report by Reuters revealed.

The research comes as Britain announced 102 new deaths of people with Covid-19, bringing its official total to nearly 45,000, the highest toll in Europe. Vaccines contain immune stimulators, which she says induce durable immune responses in ways that can be different to natural infection.

Let's have a look at what this means. Instead of people developing more antibodies during that period of time, which their immune systems would then use to fight COVID-19, the REACT (Real-time Assessment of Community Transmission) study found that antibodies fell by roughly 26% during the period in question.

People who now do not have COVID-19 symptoms but believe they were previously infected are eligible for the test, according to Kroger.

The prevalence of antibodies declined across the three rounds of testing, from 6 percent in the first round to just 4.4 percent in the most recent round.

The rapid antibody tests are conducted by a licensed health professional.

The study was released as a pre-print paper, and has not yet been peer-reviewed.

Wendy Barclay, head of the Department of Infectious Disease at Imperial College London, said this: "We can see the antibodies and we can see them declining and we know that antibodies on their own are quite protective", the Reuters report quoted.

What else did the study find?


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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".

There was no change in the levels of antibodies seen in healthcare workers - which could be due to repeated exposure to the virus.

The smallest decline in antibody levels was observed among 18-24 year olds, where the proportion with antibodies fell by 14.9%.

The exact relationship between antibody presence and coronavirus immunity remains unclear, but one study author said falling antibody levels could indicate that population immunity may also be waning.

There are different types of antibodies which might not have been detected in the study, Dr Senanayake said.

"There are lots of different antibodies which you're not detecting are present in your body which even at low levels may be able to interact with the virus in a synergistic way against infection", he said.

And some antibodies and immune cells carry a memory response which can kick into action when the body is exposed to infection.

The University of Birmingham's Karol Sikora told CGTN that the results of the study were unsurprising but hopes immunity could come from other sources.

The colder weather means more people will be socializing and congregating indoors - where the risk of infection grows.


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