COVID-19 Immunity May Shield Against Future Coronavirus Threats

Researchers at the University of Glasgow have discovered that immunity developed through COVID-19 infection and vaccination may offer a broader defense against related coronaviruses, potentially acting as a “biological barrier” against future pandemic threats. The study, published in Nature Communications, suggests that widespread immunity to SARS-CoV-2 has created an “immunity shield” that could leisurely or even prevent the emergence of a novel sarbecovirus in humans.

Broad Immunity to Sarbecoviruses

The research team, from the MRC-University of Glasgow Centre for Virus Research (CVR), combined patient antibody samples with mathematical modeling to examine immunity levels against SARS-type viruses in the general population. They found significant immunity not only to SARS-CoV-2, the virus responsible for COVID-19, but also to a range of other “sarbecoviruses”—the wider family to which SARS-CoV-2 belongs.

What are Sarbecoviruses?

Sarbecoviruses are a group of viruses within the coronavirus family. This family includes viruses capable of causing severe disease, such as SARS-CoV-1 (responsible for the 2002-2004 SARS outbreak) and MERS-CoV (Middle East respiratory syndrome–related coronavirus), as well as more common, less severe coronaviruses that cause colds. SARS-CoV-2, the virus that causes COVID-19, is a member of this family.

Vaccines Offer Potential Protection Against New Variants

The study indicates that existing COVID-19 vaccines could also help slow or stop the spread of a potential new sarbecovirus, dubbed “SARS-CoV-X.” Mathematical models suggest that implementing vaccination campaigns soon after the first case of a new sarbecovirus is detected would be most effective. Delays in vaccination could reduce the effectiveness of this preventative measure.

Expert Perspectives

“Our global experience with Covid-19 has generated a biological barrier to other coronaviruses,” said Professor Pablo Murcia, from the CVR. “While this does not mean we are immune to all future threats, infection and vaccine-derived immunity to SARS-CoV-2 has made it much harder for other sarbecoviruses to start the next pandemic.”

Professor Brian Willett, also from the CVR, added, “Our results suggest that our current vaccines might be effective against the emergence of a new coronavirus. Our mathematical models strongly suggest that the employ of existing Covid-19 vaccines against any new and emerging sarbecoviruses reduced the chance of sustained transmission.”

Implications for Future Pandemic Preparedness

These findings highlight the importance of continued research into sarbecoviruses and the potential for leveraging existing COVID-19 immunity to prepare for future pandemic threats. The research was funded by the UKRI Medical Research Council (MRC) and the UKRI Biotechnology and Biological Sciences Research Council (BBSRC).