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Covid Survivors Still At Reinfection Risk From Alpha, Beta Variants

Jun 21, 2021 | Pratirodh Bureau

Passengers wait in line to get their temperature checked at a railway station in Mumbai during the coronavirus outbreak

The immune response following a coronavirus infection can vary between individuals and may not be enough to fight Alpha and Beta variants of COVID-19, finds a study, reinforcing the need for vaccination.

The study found that people who produced a weak immune response signature, obtained at one and six months post infection, failed to show any neutralising antibodies against the Alpha variant, with none mounting a neutralising antibody response against the Beta variant.

The preprint study, which was led by the University of Oxford, in collaboration with the Universities of Liverpool, Sheffield, Newcastle and Birmingham, suggests that whether it is symptomatic or asymptomatic infection, it does not necessarily protect people long-term from COVID-19, particularly against new Variants of Concern.

“Our study is one of the most comprehensive accounts of the immune response following COVID-19 in both symptomatic and asymptomatic individuals. It is very important that we all get the COVID-19 vaccine when offered even if you think you may have previously had COVID-19,” said Christina Dold, from the University of Oxford.

“We found that individuals showed very different immune responses from each other following COVID-19, with some people from both the symptomatic and asymptomatic groups showing no evidence of immune memory six months after infection or even sooner,” Dold added.

The study examined how the immune system responds to COVID-19 in 78 healthcare workers who had experienced either symptomatic or asymptomatic disease. An additional eight patients who experienced severe disease were included for comparison.

Blood samples were taken monthly from 1-6 months post infection to examine different elements of the immune response. The report details a highly complex and variable immune response following COVID-19 infection.

The team found an early immune signature, detectable one month post infection and linked to both cellular and antibody immunity, which predicted the strength of immune response measured at six months post infection.

This is the first time that such a signature has been found and improves understanding of the development of lasting immunity.

While the majority of people who had symptomatic disease did have measurable immune responses at six months post infection, a significant minority (26 per cent) did not. The vast majority of people who experienced asymptomatic disease (92 per cent) did not exhibit a measurable immune response at six months post infection, the researchers said.

(IANS)

Tags: coronavirus, COVID-19, COVID-19 vaccination, COVID-19 variants, immune response, Pratirodh

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