World is in need of a universal coronavirus vaccine, warn scientists
They believe there is a risk that SARS-CoV-2 may mutate in ways that will render current vaccines less effective or even become ineffective.
The prestigious journal Science on Thursday published an editorial calling for a global effort to develop a universal coronavirus vaccine that would remain effective against other members of the same virus family that might cross over to humans. Wayne Koff, head of the Human Vaccines Project, and Seth Berkley, who leads the global vaccine alliance Gavi, said that although the COVID-19 pandemic was far from over, humanity now possessed the tools to end it and was undertaking the most rapid immunization campaign in history.
SARS-CoV-2 belongs to a diverse group of viruses, of which there are thousands, characterized by their crown-like appearance, which comes from the spike proteins that dot their surfaces. They are capable of infecting a wide range of animals, from bats and pangolins to pigs and mink. Four coronavirus es are known to cause common colds in humans, and historically they have been deemed a low priority for research. That changed with the 2002 SARS-CoV-1 outbreak that eventually killed some 8,000 people with a fatality rate of 10 percent. Middle East respiratory syndrome coronavirus (MERS-CoV) in 2012 was 34 percent fatal.
Koff and Berkley wrote there was a risk that SARS-CoV-2 may mutate in ways that will render current vaccines less effective — as has already been seen with the South African variant — or even become ineffective.
Moreover, the potential is growing for other coronavirus es to jump the species barrier.
"Modern agricultural practices, viral evolution, and relentless human encroachment on the natural environment mean there is an increased risk of people encountering previously isolated animal populations that harbour new strains with pandemic potential," they said. "With human migration, population growth, urbanization, rapid global travel, and climate change hastening the spread, it has never been easier for outbreaks to turn into epidemics and escalate into pandemics."
On the other hand, they argued, advances in biomedical research, computing and engineering sciences had ushered in a new era in vaccine discovery.
High-performance supercomputers can help identify new "antigens" — key viral proteins that induce immune responses, which vaccines use to train our bodies.
Databases of genetic sequences of animal coronavirus es can be used to model how they will evolve. And research into how immune systems decline with age can help improve vaccine design.
"This must be a worldwide effort. A roadmap is needed to lay out the core scientific issues as well as a framework for funding and sharing of information, data, and resources," said the scientists.
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Covaxin may offer protection against the new mutants because it protects against the whole virus while Covishield is targeted at only one protein of the virus.
Researchers noted that the D614G mutation in the coronavirus spike protein likely emerged in early 2020, and is now the most prevalent and dominant form of the virus in many countries around the world