The scientists drew on test results from 65 patients and six healthcare workers who tested positive for the virus, and a further 31 staff who volunteered to have regular antibody tests between March and June.
Researchers believe that the findings, based on the clinical records of 90 people, are virtually "a nail in the coffin" for so-called herd immunity theories, which suggest coronavirus flare-ups could be dealt with as soon as the lion's share of the world's population experiences the contagious disease. In some cases, they became undetectable.
People who have recovered from COVID-19 may not stay immune to the novel virus for long, according to new research by British scientists, suggesting people could contract it a couple of times and even repeatedly, year after year, like colds and flu, The Guardian wrote.
As Professor Jonathan Heeney, a virologist at the University of Cambridge put it, these fresh findings, one of a kind in the field, "put another nail in the coffin of the unsafe concept of herd immunity".
As per the report, experts said that the findings put "another nail in the coffin in the risky concept of herd immunity", which was used to anticipate that the public could build resistance through widespread exposure to COVID-19.
He said the patient, aged 50, tested positive for the novel coronavirus a second time - three months after a previous infection. However, the findings also revealed that an effective vaccine for the virus may need to be redeveloped every year since the protection it provides may not be very long-lasting. The study confirmed a growing body of evidence that immunity to COVID-19 is short-lived, said the report quoting Professor Jonathan Heeney, a virologist at the University of Cambridge. "One thing we know about these coronaviruses is that people can get reinfected fairly often", said Prof Stuart Neil, a co-author on the study.
"Most importantly, it puts another nail in the coffin of the risky concept of herd immunity", he told the Guardian.
"Not only will they place themselves at risk, and others, by getting infected, and losing immunity, they may even put themselves at greater risk of more severe lung disease if they get infected again in the years to come", he insisted.
Worldwide, almost 13 million confirmed cases of coronavirus have been recorded and more than 570,000 victims of COVID-19 had died by late morning Monday.
As camelid-derived antibodies are highly conserved with their human counterparts, they said these are likely to generate only low immune responses against in humans. White blood cells could also help our bodies to fight off the invading virus because of its impressive immunological memory.