Researchers find that the number of people with antibodies in their study fell by 26% since lockdown measures were relaxed.
Dr Alexander Edwards, associate professor in biomedical technology at the University of Reading, said:"What is not clear is how quickly antibody levels would rise again if a person encounters the virus a second time.
"So even if the rapid antibody test is no longer positive, the person may still be protected from re-infection."It is possible that another arm of the immune system called T-cells, may remain active, but there is currently no available test for them.They say immunisations may lead to a more robust antibody response.
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