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People who are vaccinated then get Omicron may be primed to overcome a broad range of coronavirus variants. Photo: EPA-EFE

Coronavirus: How Omicron infection turbocharges vaccinated people’s immunity

  • A pair of studies showed that infection produced even better immune responses than a booster shot in vaccinated patients
  • The findings offer a reassuring sign that the millions of vaccinated people who’ve caught Omicron probably won’t become seriously ill from another variant soon

People who are vaccinated and then get infected with Omicron may be primed to overcome a broad range of coronavirus variants, early research suggests.

A pair of studies showed that infection produced even better immune responses than a booster shot in vaccinated patients. Teams from Covid-19 vaccine maker BioNTech SE and the University of Washington posted the results on preprint server bioRxiv in recent weeks.

The findings offer a reassuring sign that the millions of vaccinated people who’ve caught Omicron probably won’t become seriously ill from another variant soon – even though the research needs to be confirmed, especially by real-world evidence.

“We should think about breakthrough infections as essentially equivalent to another dose of vaccine,” said John Wherry, a professor and director of the Institute for Immunology at the University of Pennsylvania who reviewed the BioNTech study. That could mean that if someone had Covid recently, they could wait before getting another booster shot, according to Wherry.

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Alexandra Walls, a principal scientist at the University of Washington who wrote one of the studies, cautioned that people shouldn’t seek out infections in response to the findings.

The data comes as Omicron continue to fuel outbreaks around the world, most notably in China, where residents of Shanghai have endured almost six weeks of lockdown. Waves of new variants are coming more quickly in part because Omicron is so transmissible, giving it ample opportunity to spread and mutate as countries drop restrictions, Bloomberg analyst Sam Fazeli said.

Meanwhile, regulators are weighing whether Covid-19 vaccines should be updated to target Omicron. BioNTech’s team argued that the data indicate that offering people an Omicron-adapted booster shot may be more beneficial than multiple ones with the original vaccines.

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The Washington research, conducted with Vir Biotechnology Inc, looked at blood samples from people who had been infected, then had two or three doses of vaccine, as well as those who’d caught the Delta and Omicron variants after two or three doses; others still had been vaccinated and boosted but never caught Covid-19. A final group had only been infected with Omicron and never vaccinated.

One part of the study zeroed in on antibodies, the protective proteins tailored to recognise and neutralise invaders. It showed vaccinated people who’d caught Omicron had antibodies that outperformed the others. They were even capable of recognising and attacking the very different Delta variant.

“That indicates that we are at the point where we may want to consider having a different vaccine to boost people,” said David Veesler, an assistant professor at the University of Washington, who led the research. The scientists were also able to identify antibodies in the nasal mucous of these patients, which could help them neutralise the virus as soon as it enters the body.

A lab technician uses a multichannel pipette dropper during coronavirus vaccine research. Photo: Bloomberg

Both the Washington and BioNTech studies also looked at another piece of the immune system: B cells, a type of white blood cells that can kick in to produce a burst of fresh antibodies if they recognise a pathogen. People who’d had an Omicron breakthrough infection had a broader response from these useful cells than those who’d had a booster shot but no infection.

The Washington team also found that the broad response was missing in unvaccinated people who had caught Omicron as their first exposure to the virus. This “would be a problem if a new variant that is significantly different emerged,” Veesler said.

There’s no guarantee that future mutations will be as mild as Omicron, and the pandemic’s future is hard to predict since it depends not just on immunity in the population, but also on how much the virus mutates.

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