A virus in the lab that infects cells and interacts with antibodies just like the COVID-19 virus has been created by researchers. Lab-made virus lacks the ability to cause severe disease. The findings of the study are published in the journal Cell Host and Microbe. "I've never had this many requests for a scientific material in such a short period of time, even before we published, people heard that we were working on this and started requesting the material," said study co-senior author Sean Whelan from the Washington University in the US.
‘The safer lab-made virus developed makes it possible for scientists who do not have access to high-level biosafety facilities to join the effort to find drugs or vaccines for COVID-19.’
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To create a model of Covid-19 virus that would be safer to handle, the research team started with vesicular stomatitis virus (VSV). This virus is a workhorse of virology labs because it is fairly innocuous and easy to manipulate genetically.
Primarily a virus of cattle, horses and pigs, VSV occasionally infects people, causing a mild flu-like illness that lasts three to five days.
Viruses have proteins on their surfaces that they use to latch onto and infect cells. The researchers removed VSV's surface-protein gene and replaced it with the one from Covid-19, known as spike.
The switch created a new virus that targets cells like SARS-CoV-2 but lacks the other genes needed to cause severe disease.
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Using serum from Covid-19 survivors and purified antibodies, the researchers showed that the hybrid virus was recognised by antibodies very much like a real SARS-CoV-2 virus that came from a Covid-19 patient.
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"So as long as a virus has the spike protein, it looks to the human immune system like SARS-CoV-2, for all intents and purposes," Whelan added.
The hybrid virus could help scientists evaluate a range of antibody-based preventives and treatments for Covid-19.
"Since the hybrid virus looks like SARS-CoV-2 to the immune system but does not cause severe disease, it is a potential vaccine candidate, the study authors noted.
Source-IANS